TABLE OF CONTENTS
- 1. OBJECT TYPE ARRAY/T_SEGMENTS
- 2. OBJECT TYPE/T_SEGMENT
- 2.1. T_SEGMENT/ATTRIBUTES
- 2.2. T_SEGMENT/ATTRIBUTES(T_SEGMENT)
- 2.3. T_SEGMENT/CONSTRUCTORS(T_SEGMENT)
- 2.4. T_SEGMENT/OrderBy
- 2.5. T_SEGMENT/ST_AddCurveBetweenSegments
- 2.6. T_SEGMENT/ST_Angle
- 2.7. T_SEGMENT/ST_AsText
- 2.8. T_SEGMENT/ST_AsWKT
- 2.9. T_SEGMENT/ST_Bearing
- 2.10. T_SEGMENT/ST_CheckZ
- 2.11. T_SEGMENT/ST_Closest(p_geometry p_unit)
- 2.12. T_SEGMENT/ST_ComputeDeflectionAngle
- 2.13. T_SEGMENT/ST_ComputeTangentLine
- 2.14. T_SEGMENT/ST_ComputeTangentPoint
- 2.15. T_SEGMENT/ST_Densify
- 2.16. T_SEGMENT/ST_Dims
- 2.17. T_SEGMENT/ST_Distance(p_segment p_unit)
- 2.18. T_SEGMENT/ST_Distance(p_vertex p_unit)
- 2.19. T_SEGMENT/ST_Equals
- 2.20. T_SEGMENT/ST_FindCircle
- 2.21. T_SEGMENT/ST_GetProjected
- 2.22. T_SEGMENT/ST_hasM
- 2.23. T_SEGMENT/ST_hasZ
- 2.24. T_SEGMENT/ST_Intersect
- 2.25. T_SEGMENT/ST_Intersect2CircularArcs
- 2.26. T_SEGMENT/ST_IntersectCircularArc
- 2.27. T_SEGMENT/ST_IntersectDescription
- 2.28. T_SEGMENT/ST_IntersectDetail
- 2.29. T_SEGMENT/ST_isCircularArc
- 2.30. T_SEGMENT/ST_isCollinear
- 2.31. T_SEGMENT/ST_isEmpty
- 2.32. T_SEGMENT/ST_isHorizontal
- 2.33. T_SEGMENT/ST_isPointOnSegment
- 2.34. T_SEGMENT/ST_isReversed
- 2.35. T_SEGMENT/ST_isVertical
- 2.36. T_SEGMENT/ST_Length
- 2.37. T_SEGMENT/ST_LineSubstring
- 2.38. T_SEGMENT/ST_LRS_Add_Measure
- 2.39. T_SEGMENT/ST_LRS_Compute_Measure
- 2.40. T_SEGMENT/ST_LRS_Dim
- 2.41. T_SEGMENT/ST_LRS_isMeasured
- 2.42. T_SEGMENT/ST_LRS_Measure_Length
- 2.43. T_SEGMENT/ST_MaxX
- 2.44. T_SEGMENT/ST_MaxY
- 2.45. T_SEGMENT/ST_MBR
- 2.46. T_SEGMENT/ST_Merge
- 2.47. T_SEGMENT/ST_MidPoint
- 2.48. T_SEGMENT/ST_MinX
- 2.49. T_SEGMENT/ST_MinY
- 2.50. T_SEGMENT/ST_OffsetBetween
- 2.51. T_SEGMENT/ST_OffsetPoint
- 2.52. T_SEGMENT/ST_Parallel
- 2.53. T_SEGMENT/ST_PointAlong
- 2.54. T_SEGMENT/ST_PointAlongOffset
- 2.55. T_SEGMENT/ST_ProjectPoint
- 2.56. T_SEGMENT/ST_Reverse
- 2.57. T_SEGMENT/ST_Round
- 2.58. T_SEGMENT/ST_Round(x y z m)
- 2.59. T_SEGMENT/ST_SdoGeometry
- 2.60. T_SEGMENT/ST_Self
- 2.61. T_SEGMENT/ST_SetCoordinates(vertex vertex vertex)
- 2.62. T_SEGMENT/ST_SetCoordinates(vertex vertex)
- 2.63. T_SEGMENT/ST_SetPrecisionModel
- 2.64. T_SEGMENT/ST_SRID
- 2.65. T_SEGMENT/ST_To2D
- 2.66. T_SEGMENT/ST_To3D
- 2.67. T_SEGMENT/ST_UpdateCoordinate(p_vertex)
- 2.68. T_SEGMENT/STPointToCircularArc
- 2.69. T_SEGMENT/STPointToLineString
OBJECT TYPE ARRAY/T_SEGMENTS [ Structures ]
[ Top ] [ Structures ]
NAME
T_SEGMENTS -- An array (collection/table) of T_SEGMENT type.
DESCRIPTION
An array of T_SEGMENT that a PIPELINED function can use to return T_SEGMENT objects.
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
SOURCE
CREATE OR REPLACE TYPE &&INSTALL_SCHEMA..T_SEGMENTS AS TABLE OF &&INSTALL_SCHEMA..T_SEGMENT
OBJECT TYPE/T_SEGMENT [ Types ]
NAME
T_SEGMENT -- Object type representing a single 2-point linestring or single 3 point circular arc.
DESCRIPTION
An object type that represents a single segment of a linestring.
A segment is composed of a minimum of two T_VERTEX objects with Implied director (SEGMENT) from start to end.
When a segment/segment contains a mid coordinate, that segment defines a circular arc.
Includes Methods on that type.
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ATTRIBUTES [ Variables ]
[ Top ] [ T_SEGMENT ] [ Variables ]
ATTRIBUTES
element_id -- Top level part identifier of multi-part geometry
eg multi-linestring composed of two lines generates element_ids 1 and 2.
subelement_id -- Part id of any sub-elements of a single geometry part
eg inner ring of a single polygon; circular curve of single linestring.
segment_id -- Id of segments in sequential order appears in original geometry
startCoord -- Ordinates of start point
midCoord -- Ordinates of mid point of circular arc
endCoord -- Ordinates of end point
sdo_gtype -- Geometry Type of segment
sdo_srid -- Spatial Reference ID of segment
projected -- If planar then 1 else 0
precisionModel -- Holds precision information for object
SOURCE
element_id integer, subelement_id integer, segment_Id Integer, startCoord &&INSTALL_SCHEMA..T_Vertex, midCoord &&INSTALL_SCHEMA..T_Vertex, /* If circular arc */ endCoord &&INSTALL_SCHEMA..T_Vertex, sdo_gtype integer, sdo_srid integer, projected integer, PrecisionModel &&INSTALL_SCHEMA..T_PrecisionModel, /* Holds XYZM ordinate scale/precision values */
T_SEGMENT/CONSTRUCTORS(T_SEGMENT) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
A collection of T_SEGMENT Constructors.
SOURCE
-- Useful as an "Empty" constructor. Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT) Return Self As Result, Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_segment in &&INSTALL_SCHEMA..T_SEGMENT) Return Self As Result, Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_line in mdsys.sdo_geometry, p_segment_id in integer default 0, p_precision in integer default 3, p_tolerance in number default 0.005 ) Return Self As Result, Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_sdo_gtype In Integer, p_sdo_srid In Integer, p_projected in integer default 1, p_precision in integer default 3, p_tolerance in number default 0.005) Return Self As Result, -- T_VERTEX Constructors Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_segment_id In Integer, p_startCoord In &&INSTALL_SCHEMA..T_Vertex, p_endCoord In &&INSTALL_SCHEMA..T_Vertex, p_sdo_gtype In Integer default null, p_sdo_srid In Integer default null, p_projected in integer default 1, p_precision in integer default 3, p_tolerance in number default 0.005) Return Self As Result, Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_segment_id In Integer, p_startCoord In &&INSTALL_SCHEMA..T_Vertex, p_midCoord In &&INSTALL_SCHEMA..T_Vertex, p_endCoord In &&INSTALL_SCHEMA..T_Vertex, p_sdo_gtype In Integer default null, p_sdo_srid In Integer default null, p_projected in integer default 1, p_precision in integer default 3, p_tolerance in number default 0.005 ) Return Self As Result, Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_element_id In Integer, p_subelement_id In Integer, p_segment_id In Integer, p_startCoord In &&INSTALL_SCHEMA..T_Vertex, p_endCoord In &&INSTALL_SCHEMA..T_Vertex, p_sdo_gtype In Integer default null, p_sdo_srid In Integer default null, p_projected in integer default 1, p_precision in integer default 3, p_tolerance in number default 0.005) Return Self As Result, Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_element_id In Integer, p_subelement_id In Integer, p_segment_id In Integer, p_startCoord In &&INSTALL_SCHEMA..T_Vertex, p_midCoord In &&INSTALL_SCHEMA..T_Vertex, p_endCoord In &&INSTALL_SCHEMA..T_Vertex, p_sdo_gtype In Integer default null, p_sdo_srid In Integer default null, p_projected in integer default 1, p_precision in integer default 3, p_tolerance in number default 0.005) Return Self As Result, -- MDSYS.VERTEX_TYPE Constructors Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_segment_id In Integer, p_startCoord In mdsys.vertex_type, p_endCoord In mdsys.vertex_type, p_sdo_gtype In Integer default null, p_sdo_srid In Integer default null, p_projected in integer default 1, p_precision in integer default 3, p_tolerance in number default 0.005 ) Return Self As Result, Constructor Function T_SEGMENT(SELF IN OUT NOCOPY T_SEGMENT, p_segment_id In Integer, p_startCoord In mdsys.vertex_type, p_midCoord In mdsys.vertex_type, p_endCoord In mdsys.vertex_type, p_sdo_gtype In Integer default null, p_sdo_srid In Integer default null, p_projected in integer default 1, p_precision in integer default 3, p_tolerance in number default 0.005) Return Self As Result,
T_SEGMENT/OrderBy [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
OrderBy -- Implements ordering function that can be used to sort a collection of T_Vertex objects.
SYNOPSIS
Order Function OrderBy(p_segment in &&INSTALL_SCHEMA..T_SEGMENT) Return Number deterministic
ARGUMENTS
p_segment (T_SEGMENT) - Order pair
DESCRIPTION
This order by function allows a collection of T_Vertex objects to be sorted.
For example in the ORDER BY clause of a SELECT statement.
Comparison only uses ordinates: X, Y, Z and W.
If precision is an issue, the two segments have to be rounded before this method can be used.
EXAMPLE
With segments as (
select T_SEGMENT(p_segment_id=> LEVEL,
p_startCoord=>T_Vertex(p_x=>dbms_random.value(0,level),
p_y=>dbms_random.value(0,level),
p_id=>1,
p_sdo_gtype=>2001,
p_sdo_srid=>null),
p_endCoord=>T_Vertex(p_x=>dbms_random.value(0,level),
p_y=>dbms_random.value(0,level),
p_id=>2,
p_sdo_gtype=>2001,
p_sdo_srid=>null),
p_sdo_gtype=>3002,
p_sdo_srid=>null
) as segment
from dual
connect by level < 5
)
select a.segment.st_astext(2) as segment
from segments a
order by a.segment;
SEGMENT
---------------------------------------------------------------------------------------------------------------------------
SEGMENT(NULL,NULL,1,Start(.51,.86,NULL,NULL,1,2001,NULL),End(.2,.43,NULL,NULL,2,2001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
SEGMENT(NULL,NULL,2,Start(1.3,1.31,NULL,NULL,1,2001,NULL),End(.96,1.56,NULL,NULL,2,2001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
SEGMENT(NULL,NULL,3,Start(.84,2.03,NULL,NULL,1,2001,NULL),End(.55,.23,NULL,NULL,2,2001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
SEGMENT(NULL,NULL,4,Start(2.69,1.34,NULL,NULL,1,2001,NULL),End(2.65,1.37,NULL,NULL,2,2001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
4 rows selected
RESULT
order value (NUMBER) - -1 less than; 0 equal; 1 greater than
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_AddCurveBetweenSegments [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_AddCurveBetweenSegments -- Adds Circular Curve between two segments
SYNOPSIS
Member Function ST_AddCurveBetweenSegments(
p_segment In &&INSTALL_SCHEMA..T_Segment,
p_iVertex in &&INSTALL_SCHEMA..T_Verex default NULL,
p_radius In number default null,
p_unit In varchar2 default NULL)
Return mdsys.sdo_Geometry Deterministic,
DESCRIPTION
Adds Circular Curve between two segments.
The segments can be 2 point linestrings or 3 point circular curves.
How the circular cuve is added depends on the parameters.
1. If SELF and p_segment do not meet, and the intersectoin point between
SELF.endCoord and p_segment.startCoord is not provided, the intersection point
is computed using ST_IntersectDetail.
2. If p_radius is provided a circular curve is fitted between end/mid/start of radius p_radius.
3. If p_iVertex, p_radius are not provided, the best circular arc is fittd.
The implementation honours 3D and 4D shapes and averages these dimension values
for the new vertices.
ARGUMENTS
p_segment (T_Segment) -- Other, unconnected, segment
p_iVertex (T_Vertex) -- The intersectoin point between the two segments.
p_radius (number) -- Optional Radius.
p_unit (Varchar2) -- If NULL, the calculations are done using the underlying projection default units.
If an Oracle Unit of Measure is supplied (eg unit=M) that is value for the SRID,
this value is used when calculating the p_offset distance.
RESULT
geometry (sdo_geometry) -- sdo_geometry with self and p_segment joined by circular arc.
EXAMPLE
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 -- Original coding.
Simon Greener - August 2018 -- Ensure all cases correct esp for 3D (XYZ)
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Angle [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Angle -- Computes the angle that the vector defined by this segment makes with the X-axis.
SYNOPSIS
Member Function ST_Angle
Return number Deterministic,
DESCRIPTION
Computes the angle that the vector defined by this segment makes with the X-axis.
The angle will be in the range [ -PI, PI ] radians.
RESULT
angle (Number) -- The angle this segment makes with the X-axis (in radians)
EXAMPLE
-- Simple angle
select round(
T_Segment(
sdo_geometry('LINESTRING(0 0,10 10)',null)
).ST_Angle(),
3
) as angle
from dual;
ANGLE
----------
.785
SEE ALSO
T_SEGMENT.ST_Bearing COGO.ST_Degrees
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_AsText [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_AsText -- Returns text Description of underlying segment
SYNOPSIS
Member Function ST_AsText
Return Varchar2 Deterministic,
DESCRIPTION
Returns textual description of segment.
RESULT
String - T_SEGMENT in text format.
EXAMPLE
with data as (
select sdo_geometry(4402,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349,1.3456,0.0005, 10.87365,11.983645,1.98434,14.38573)) as geom
From Dual
Union all
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349,1.3456,10.87365,11.983645,1.98434)) as geom
From Dual
Union all
select sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349, 10.87365,11.983645 )) as geom
from dual
)
select T_Segment(a.geom).ST_AsText() as geomText
from data a;
GEOMTEXT
------------------------------------------------------------------------------------------------------------------------------------------------
SEGMENT(NULL,NULL,0,Start(1,.0023763,.18349,1.346,.001,4401,NULL),End(2,10.87365,11.983645,1.984,14.386,4401,NULL),SDO_GTYPE=4402,SDO_SRID=NULL)
SEGMENT(NULL,NULL,0,Start(1,.0023763,.18349,1.346,NULL,3001,NULL),End(2,10.87365,11.983645,1.984,NULL,3001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
SEGMENT(NULL,NULL,0,Start(1,.0023763,.18349,NULL,NULL,2001,NULL),End(2,10.87365,11.983645,NULL,NULL,2001,NULL),SDO_GTYPE=2002,SDO_SRID=NULL)
TODO
Create Function, ST_FromText(), to create T_Segment from ST_AsText representation.
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_AsWKT [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_AsWKT -- Exports T_SEGMENT object to its Extended Well Known Text (EWKT).
SYNOPSIS
Member Function ST_AsWKT
Return varchar2 Deterministic,
DESCRIPTION
Returns Extended Well Known Text representation of underlying T_GEOEMTRY.
Supports 2D/3D/4D t_segments.
Formatting of ordinates supported by supplied p_format_model eg TM9 or FM999999999999990D0
RESULT
WKT (CLOB) -- eg Well Known Text encoding of mdsys.sdo_geometry object.
EXAMPLE
With data as (
select t_segment(sdo_geometry(2002,28355,NULL,
sdo_elem_info_array(1,2,2),
sdo_ordinate_array(252230.4743434348,5526918.37343433, 252400.034348,5526918.33434333473,252230.4434343378,5527000.433445660))) as segment
from dual union all
select t_segment(SDO_GEOMETRY(3002,28355,NULL,
sdo_elem_info_array(1,2,2),
sdo_ordinate_array(252230.478,5526918.373,1.5, 252400.08,5526918.373,1.5, 252230.478,5527000.0,1.5))) as segment
from dual union all
select t_segment(SDO_GEOMETRY(3302,28355,NULL,
sdo_elem_info_array(1,2,2),
sdo_ordinate_array(252230.478,5526918.373,0.0, 252400.08,5526918.373,417.4, 252230.478,5527000.0,506.88))) as segment
from dual union all
select t_segment(SDO_GEOMETRY(4402,28355,NULL,
sdo_elem_info_array(1,2,2),
sdo_ordinate_array(252230.478,5526918.373,1.5,0.0, 252400.08,5526918.373,1.5,417.4, 252230.478,5527000.0,1.5,506.88))) as segment
from dual union all
select t_segment(sdo_geometry(2002,NULL,NULL,
sdo_elem_info_array(1,2,1),
sdo_ordinate_array(100,100,900,900.0))) as segment
from dual union all
select t_segment(sdo_geometry(3002,NULL,NULL,
sdo_elem_info_array(1,2,1),
sdo_ordinate_array(0,0,1, 10,0,2))) as segment
from dual union all
select t_segment(sdo_geometry(3302,NULL,NULL,
sdo_elem_info_array(1,2,1),
sdo_ordinate_array(0,0,1.5, 10,0,1.5, 10,5,1.5 ))) as segment
from dual union all
select t_segment(sdo_geometry(4402,4283,null,
sdo_elem_info_array(1,2,1),
sdo_ordinate_array(147.5,-42.5,849.9,102.0, 147.6,-42.5,1923.0,2100.0))) as segment
From Dual
)
select a.segment.sdo_gtype as gtype,
a.segment
.ST_Round(3)
.ST_AsEWKT('TM9') as ewkt
from data a;
GTYPE EWKT
----- ------------------------------------------------------------------------------------------------------------------------
2002 SRID=28355;CIRCULARSTRING (252230.474 5526918.373,252400.034 5526918.334,252230.443 5527000.433)
3002 SRID=28355;CIRCULARSTRINGZ (252230.478 5526918.373 1.5,252400.08 5526918.373 1.5,252230.478 5527000 1.5)
3302 SRID=28355;CIRCULARSTRINGM (252230.478 5526918.373 0,252400.08 5526918.373 417.4,252230.478 5527000 506.88)
4402 SRID=28355;CIRCULARSTRINGZM (252230.478 5526918.373 1.5 0,252400.08 5526918.373 1.5 417.4,252230.478 5527000 1.5 506.88)
2002 LINESTRING (100 100,900 900)
3002 LINESTRINGZ (0 0 1,10 0 2)
3302 LINESTRINGM (0 0 1.5,10 0 1.5)
4402 SRID=4283;LINESTRINGZM (147.5 -42.5 849.9 102,147.6 -42.5 1923 2100)
8 rows selected
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Bearing [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Bearing -- Returns Bearing, in degrees, from start to end (possibly normalized to 0..360 degree range.
SYNOPSIS
Member Function ST_Bearing(p_normalize in integer default 1)
Return Number Deterministic
DESCRIPTION
This function computes a bearing from the current object point's startCoord to its EndCoord.
ST_Bearing returns a whole circle bearing in range 0..360 is normalize flag is set.
ARGUMENTS
p_normalize (integer) -- 1 is normalise bearing to 0..360 degree range, 0 leave as calculated
RESULT
bearing (Number) -- Bearing in Degrees.
EXAMPLE
-- Simple bearing for projected data
select round(
T_Segment(
sdo_geometry('LINESTRING(0 0,10 10)',null)
).ST_Bearing(
),3) as bearing
from dual;
BEARING
-------
45
-- Simple geodetic bearing (2D)
select COGO.DD2DMS(
T_Segment(
sdo_geometry(2002,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5,-42.5, 147.6,-42.5))
).ST_Bearing(
)) as bearing
from dual;
BEARING
-----------
90°2'1.606"
SEE ALSO
T_VERTEX.ST_Bearing COGO.ST_Degrees
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_CheckZ [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_CheckZ -- Checks Z values on linString or CircularArc
SYNOPSIS
Member Function ST_CheckZ
Return Integer Deterministic,
DESCRIPTION
The circularArc mathematics are considered to be 2D;
If a circularArc coordinate contains a Z ordinate, then its value has to be the same for all coordinates to remain in the same plane;
If the segment is a lineString, its Z values don't need checking;.
RESULT
BOOLEAN (INTEGER) -- 1 if segment's Z ordinates pass checking.
NOTES
See also t_segment constructors that take a valid midCoord t_vertex parameter value.
Where ST_CheckZ fails for a t_segment constructor, the error message is the same as for SQL Server Spatial.
EXAMPLE
-- Check ST_CheckZ for valid planar circularArc segment
select T_Segment(
SDO_GEOMETRY(3002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252230.478,5526918.373,1.0, 252400.08,5526918.373,1.0, 252230.478,5527000.0,1.0))
).ST_CheckZ() as tsegment
from dual;
TSEGMENT
----------
1
-- Test ST_CheckZ built in to circularArc segment constructors
select T_Segment(
SDO_GEOMETRY(3002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252230.478,5526918.373,2.0, 252400.08,5526918.373,2.5, 252230.478,5527000.0,3.0))
) as tsegment
from dual;
Error starting at line 129 in command:
select T_Segment(SDO_GEOMETRY(3002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252230.478,5526918.373,2.0, 252400.08,5526918.373,2.5, 252230.478,5527000.0,3.0)))
as geom from dual
Error report:
SQL Error: ORA-20214: Circular arc segments with Z values must have equal Z value for all 3 points.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Closest(p_geometry p_unit) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Closest -- Finds nearest point on line where supplied geometry comes closest (snap to).
SYNOPSIS
Member Function ST_Closest(p_geometry in mdys.sdo_geometry,
p_unit In varchar2 DEFAULT NULL
)
Return &&INSTALL_SCHEMA..T_Vertex Deterministic
DESCRIPTION
Finds nearest point on segment where supplied geometry comes closest (snap).
Computations respect SRID and unit as uses SDO_GEOM.SDO_CLOSEST_POINTS.
If SDO_GEOM.SDO_CLOSEST_POINTS fails, a result is calculated using planar arithmetic.
This function handles fact that SDO_GEOM function does not support measured segments.
ARGUMENTS
p_geometry (sdo_geometry) - Any sdo_geometry object.
p_unit (Varchar2) - Oracle Unit of Measure eg unit=M.
RESULT
vertex (T_Vertex) -- Nearest point on line supplied vertex is nearest to.
EXAMPLE
-- Planar
-- Planar 3D
With tGeom as (
select sdo_geometry(3001,90000006,Sdo_point_type(562038.848,1013262.454,0.0),NULL,NULL) as geometry,
t_geometry(SDO_GEOMETRY(3002,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),
SDO_ORDINATE_ARRAY(
562046.642,1013077.602,0, 562032.193,1013252.074,0.035,
562028.848,1013292.454,0.043, 562018.682,1013424.977,0.07,
562007.163,1013575.247,0.099, 561981.686,1013900.825,0.16,
561971.702,1014043.346,0.187, 561968.808,1014089.436,0.196,
561966.077,1014146.249,0.207, 561957.494,1014376.425,0.25,
561941.333,1014879.5,0.345, 561934.844,1015013.849,0.37,
561930.843,1015108.115,0.388, 561926.975,1015245.592,0.414,
561922.233,1015468.243,0.456, 561918.631,1015586.912,0.478,
561912.301,1015756.343,0.51, 561910.44,1015825.101,0.523,
561909.946,1015874.059,0.532, 561910.027,1015909.594,0.539,
561910.765,1015948.408,0.547, 561913.6,1016019.49,0.561,
561917.047,1016069.767,0.57, 561919.944,1016103.33,0.577,
561927.81,1016171.894,0.59, 561934.889,1016220.292,0.599,
561939.73,1016249.091,0.605, 561949.697,1016302.867,0.615,
561965.347,1016374.268,0.629, 561972.535,1016402.687,0.634
)),
0.0005,3,1)
as lrs_tgeom
from dual
)
select t.segment
.ST_Closest(
p_geometry => a.geometry,
p_unit => 'unit=M'
)
.ST_Round(3)
.ST_AsText() as closestPoint
from tGeom a,
table(a.lrs_tgeom.ST_Segmentize(p_filter=>'DISTANCE',
p_vertex=>SELF.T_Vertex(a.geometry)) t;
CLOSESTPOINT
----------------------------------------------------------
T_Vertex(562031.384,1013261.836,.037,NULL,NULL,3001,90000006)
-- Geodetic
With data as (
select SDO_GEOMETRY(2001,4326,SDO_POINT_TYPE(147.439,-43.195,NULL),NULL,NULL) as point,
sdo_geometry(3002,4326,NULL,sdo_elem_info_array(1,2,1),
sdo_ordinate_array(147.50,-43.132,100.0, 147.41,-43.387,30000.0)) as line
from dual
)
select T_Segment(a.line)
.ST_Closest(
p_vertex => T_Vertex(a.point),
p_unit => 'unit=M'
)
.ST_Round(8)
.ST_AsText() as closestPoint
from data a;
CLOSESTPOINT
------------------------------------------------------------
T_Vertex(147.47543293,-43.20182579,NULL,NULL,NULL,2001,4326)
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_ComputeDeflectionAngle [ Functions ]
[ Top ] [ T_SEGMENT ] [ Functions ]
NAME
ST_ComputeDeflectionAngle - Computes deflection angle between two segments.
SYNOPSIS
Member Function ST_ComputeDeflectionAngle
p_segment t_segment default null,
)
Return Number
DESCRIPTION
This function computes the deflection angle between two segments: SELF.start->(bearing)->SELF.end deflect p_segment.start->(bearing)->p_segment.end
The deflection angle from the projection of the first line to the direction(bearing) of the first line.
If the underlying segment is a circular arc, p_segment is ignored and a deflection angle is computed between the circular arc's three vertices.
If p_segment is supplied its first coordinate is assumed to be the same as the last point of SELF; if not a "virtual" deflection is computed.
If SELF.projected = 0 deflection angle is computed using geodetic math (see MDSYS.SDO_UTIL.BEARING_TILT_FOR_POINTS)
INPUTS
p_segment (t_segment) - A linestring segment
RESULT
angle (number) - Deflection angle in degrees.
AUTHOR
Simon Greener
HISTORY
Simon Greener - April 2019 - Original coding.
COPYRIGHT
(c) 2008-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_ComputeTangentLine [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_ComputeTangentLine -- Computes point that would define a tangential line at the nominated position on the circular arc
SYNOPSIS
Member Function ST_ComputeTangentLine(p_position in VarChar2,
p_fraction In Number default 0.0,
p_unit IN varchar2 default NULL)
Return T_Segment Deterministic,
DESCRIPTION
There is a need to be able to create a tangent line at any point on a circular arc.
This function computes a tangential line at the start/mid or end coord.
INPUTS
p_position (varchar2) -- Requests tangent point for 'START', 'MID', 'END' point, or 'FRACTION' of circular arc.
p_fraction (number) -- Fractional value between 0.0 and 1.0 (length)
p_unit (varchar2) -- If NULL, the calculations are done using the underlying projection default units.
If an Oracle Unit of Measure is supplied (eg unit=M) that is value for the SRID.
RESULT
line (T_Segment) -- A tangent line.
EXAMPLE
with data as (
select T_Segment(
SDO_GEOMETRY('CIRCULARSTRING(252230.478 5526918.373, 252400.08 5526918.373, 252230.478 5527000.0)',null)
) as circular_string
from dual
)
select a.circular_string.ST_SdoGeometry() as geom
from data a
union all
select b.circular_string
.ST_ComputeTangentLine(
p_position=>case t.IntValue
when 1 then 'START'
when 2 then 'MID'
when 3 then 'END'
end
).ST_SdoGeometry() as geom
from data b,
table(tools.generate_series(1,3,1)) t;
GEOM
----------------------------------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252230.478,5526918.373, 252400.08,5526918.373, 252230.478,5527000.0))
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252230.478,5526918.373, 252250.88475,5526875.9725))
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252400.08,5526918.373, 252420.48675,5526960.7735))
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252230.478,5527000.0, 252250.88475,5527042.4005))
-- Fraction.
with data as (
select T_Segment(
SDO_GEOMETRY('CIRCULARSTRING(252230.478 5526918.373, 252400.08 5526918.373, 252230.478 5527000.0)',28355)
) as circular_string
from dual
)
select CAST(NULL AS Number) as fraction,
a.circular_string.ST_SdoGeometry() as geom
from data a
union all
select CAST(t.IntValue as number) / 10.0 as fraction,
b.circular_string
.ST_ComputeTangentLine(
p_position =>'FRACTION',
p_fraction => CAST(t.IntValue as number) / 10.0,
p_unit => 'unit=M' )
.ST_Round(3)
.ST_SdoGeometry() as tangentLine
from data b,
table(tools.generate_series(0,10,1)) t;
FRACTION GEOM
---------- --------------------------------------------------------------------------------------------------------------------------------------------
NULL SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252230.478,5526918.373,252400.08,5526918.373,252230.478,5527000))
0 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252230.478,5526918.373,252250.885,5526875.973))
0.1 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252221.549,5526967.649,252217.318,5526920.784))
0.2 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252239.159,5527014.529,252211.488,5526976.469))
0.3 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252278.323,5527045.738,252235.047,5527027.261))
0.4 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252327.951,5527052.441,252281.324,5527058.777))
0.5 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252373.991,5527032.738,252337.215,5527062.094))
0.6 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252403.406,5526992.209,252419.918,5526948.146))
0.7 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252407.868,5526942.33,252399.44,5526896.035))
0.8 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252386.114,5526897.224,252355.132,5526861.806))
0.9 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252344.302,5526869.662,252299.54,5526855.151))
1 SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(252294.273,5526867.449,252248.404,5526877.953))
12 rows selected
NOTES
If SELF.projected is 1 then calculations are PLANAR or PROJECTED, otherwise GEODETIC/GEOGRAPHIC.
AUTHOR
Simon Greener
HISTORY
Simon Greener - June 2011 - Original Coding
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_ComputeTangentPoint [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_ComputeTangentPoint -- Computes point that would define a tandential line at the start, mid or end point of a circular arc
SYNOPSIS
Member Function ST_ComputeTangentPoint(p_position In VarChar2,
p_fraction In Number default 0.0,
p_unit IN varchar2 default NULL)
Return T_Vertex Deterministic,
DESCRIPTION
There is a need to be able to compute an angle between a linestring and a circularstring.
To do this, one needs to compute a tangential line at the start, mid, end or user fraction of a circularstring.
This function computes point that would define a tangential line at the start, mid or end of a circular arc.
INPUTS
p_position (varchar2) -- Requests tangent point for 'START', 'MID', 'END' point, or 'FRACTION' of circular arc.
p_fraction (number) -- Fractional value between 0.0 and 1.0 (length)
p_unit (varchar2) -- If NULL, the calculations are done using the underlying projection default units.
If an Oracle Unit of Measure is supplied (eg unit=M) that is value for the SRID.
RESULT
point (T_Vertex) -- A tangent point that combined with the start, mid or end of the circularstring creates a tangential line.
EXAMPLE
select T_Segment(
p_Segment_id => 0,
p_startCoord => T_Vertex(
p_id => 1,
p_x => 10,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_midCoord => T_Vertex(
p_id => 2,
p_x => 15,
p_y => 5,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_endCoord => T_Vertex(
p_id => 3,
p_x => 20,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_sdo_gtype => 2002,
p_sdo_srid => NULL
)
.ST_ComputeTangentPoint(p_position =>'START')
.ST_AsText() as tangentPoint
from dual;
TANGENTPOINT
------------------------------------
T_Vertex(10,5,NULL,NULL,1,2001,NULL)
-- Circular String all points tangent
with data as (
select T_Segment(
SDO_GEOMETRY('CIRCULARSTRING(252230.478 5526918.373, 252400.08 5526918.373, 252230.478 5527000.0)',null)
) as circular_string
from dual
)
select a.circular_string.ST_SdoGeometry() as geom
from data a
union all
select b.circular_string
.ST_ComputeTangentPoint(
p_position=>cast(case t.IntValue
when 1 then 'START'
when 2 then 'MID'
when 3 then 'END'
end as varchar(5))
).ST_SdoGeometry() as geom
from data b,
table(tools.generate_series(1,3,1)) t;
GEOM
-------------------------------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252230.478,5526918.373,252400.08,5526918.373,252230.478,5527000))
SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(252189.6645,5527003.174,NULL),NULL,NULL)
SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(252440.8935,5527003.174,NULL),NULL,NULL)
SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(252189.6645,5526915.199,NULL),NULL,NULL)
-- Fraction
select CAST(t.IntValue as number) / 10.0 as fraction,
T_Segment(
p_Segment_id => 0,
p_startCoord => T_Vertex(
p_id => 1,
p_x => 10,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_midCoord => T_Vertex(
p_id => 2,
p_x => 15,
p_y => 5,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_endCoord => T_Vertex(
p_id => 3,
p_x => 20,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_sdo_gtype => 2002,
p_sdo_srid => NULL
)
.ST_ComputeTangentPoint(p_position =>'FRACTION',
p_fraction => CAST(t.IntValue as number) / 10.0)
.ST_Round(3)
.ST_SdoGeometry() as tangentPoint
from table(tools.generate_series(0,10,1)) t;
FRACTION TANGENTPOINT
---------- -------------------------------------------------------------------
0 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(10,-2.5,NULL),NULL,NULL)
0.1 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(9.472,-0.833,NULL),NULL,NULL)
0.2 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(9.485,0.916,NULL),NULL,NULL)
0.3 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(10.039,2.576,NULL),NULL,NULL)
0.4 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(11.077,3.983,NULL),NULL,NULL)
0.5 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(12.5,5,NULL),NULL,NULL)
0.6 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(18.923,3.983,NULL),NULL,NULL)
0.7 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(19.961,2.576,NULL),NULL,NULL)
0.8 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(20.515,0.916,NULL),NULL,NULL)
0.9 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(20.528,-0.833,NULL),NULL,NULL)
1 SDO_GEOMETRY(2001,NULL,SDO_POINT_TYPE(20,-2.5,NULL),NULL,NULL)
11 rows selected
NOTES
If SELF.projected is 1 then calculations are PLANAR or PROJECTED, otherwise GEODETIC/GEOGRAPHIC.
AUTHOR
Simon Greener
HISTORY
Simon Greener - June 2011 - Original Coding
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Densify [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Densify -- Implements a basic geometry densification algorithm.
SYNOPSIS
Member Function ST_Densify(p_distance in number)
p_unit IN varchar2 default NULL)
Return mdsys.sdo_Geometry Deterministic
DESCRIPTION
This function add vertices to an existing vertex-to-vertex described geometry segment.
New vertices are added in such a way as to ensure that no two vertices will
ever fall with SELF.PrecisionModel.XY.
Also, because of the nature of the implementation there is no guarantee that the
added vertices will be p_distance apart.
The implementation prefers to balance the added vertices across a complete segment
such that an even number are added. The final vertex separation will be
BETWEEN p_distance AND p_distance * 2 .
The implementation honours 3D and 4D shapes and averages these dimension values
for the new vertices.
ARGUMENTS
p_distance (Number) -- The desired optimal distance between added vertices. Must be > SELF.tolerance.
RESULT
geometry (sdo_geometry) -- Densified geometry.
EXAMPLE
NOTES
Does not support CircularArc segments.
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 -- Original coding.
Simon Greener - August 2018 -- Ensure all cases correct esp for 3D (XYZ)
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Dims [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Dims -- Returns number of ordinate dimensions
SYNOPSIS
Member Function ST_Dims
Return INTEGER Deterministic,
DESCRIPTION
Examines SDO_GTYPE (2XXX etc) and extracts coordinate dimensions.
If SDO_GTYPE is null, examines ordinates eg XY not null, Z null -> 2.
RESULT
BOOLEAN (INTEGER) -- 2 if data 2D; 3 if 3D; 4 if 4D
EXAMPLE
with data as (
select T_Segment(
SDO_GEOMETRY('CIRCULARSTRING(252230.478 5526918.373, 252400.08 5526918.373, 252230.478 5527000.0)',28355)
) as circular_segment
from dual
)
select a.circular_segment.ST_Dims() as Dims
from data a;
DIMS
----
2
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Distance(p_segment p_unit) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Distance -- Returns Distance from segment to the supplied segment (T_Segment)
SYNOPSIS
Member Function ST_Distance(p_segment in &&INSTALL_SCHEMA..T_Segment, p_unit in varchar2 DEFAULT NULL) Return Number Deterministic
DESCRIPTION
(Wrapper over sdo_geometry ST_Distance method). This function computes a distance from the input T_Segment object to the underlying T_SEGMENT. Result is in the distance units of the SDO_SRID, or in p_units where supplied.
ARGUMENTS
p_segment (T_SEGMENT) - A single T_Segment from which a distance to the segment is calculated. p_unit (VARCHAR2) - Oracle Unit of Measure eg unit=M.
RESULT
distance (Number) -- Distance in SRID unit of measure or in supplied units (p_unit)
EXAMPLE
-- Examples of ST_Distance to T_Vertex single poins with data as ( select 'Planar LineString to Point' as test, sdo_geometry('LINESTRING(0 0,10 10)',null) as geom, sdo_geometry('POINT(5 0)',null) as dGeom from dual union all select 'Geo LineString to Point' as test, sdo_geometry('LINESTRING(147.50 -43.132,147.41 -43.387)',4326) as geom, sdo_geometry('POINT(147.3 -43.2)',4326) as dGeom from dual union all select 'Planar CircularString to Point' as test, SDO_GEOMETRY(2002,28355,NULL, SDO_ELEM_INFO_ARRAY(1,2,2), -- Circular Arc line string SDO_ORDINATE_ARRAY(252230.478,5526918.373, 252400.08,5526918.373,252230.478,5527000.0)) as geom, SDO_GEOMETRY('POINT(252429.706 5527034.024)',28355) as dGeom from dual ) select a.test, T_Segment(a.geom).ST_Distance(p_vertex=>T_Vertex(a.dGeom),p_unit=>NULL) as d_in_meters, T_Segment(a.geom).ST_Distance(p_vertex=>T_Vertex(a.dGeom),p_unit=>'unit=KM') as l_in_km from data a; TEST D_IN_METERS L_IN_KM ------------------------------ ----------- ---------- Planar LineString to Point 3.535534 3.535534 Geo LineString to Point 13820.16185 13.820162 Planar CircularString to Point 42.61532 0.042615
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Distance(p_vertex p_unit) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Distance -- Returns Distance from segment supplied T_Vertex (Wrapper)
SYNOPSIS
Member Function ST_Distance(p_vertex in &&INSTALL_SCHEMA..T_Vertex, p_unit in varchar2 DEFAULT NULL) Return Number Deterministic
DESCRIPTION
(Wrapper over sdo_geometry ST_Distance method). This function computes a distance from the input T_Vertex object to the underlying T_SEGMENT. Result is in the distance units of the SDO_SRID, or in p_units where supplied.
ARGUMENTS
p_geom (T_VERTEX) - A single vertex from which a bearing to the segment is calculated. p_unit (VARCHAR2) - Oracle Unit of Measure eg unit=M.
RESULT
distance (Number) -- Distance in SRID unit of measure or in supplied units (p_unit)
EXAMPLE
-- Examples of ST_Distance to T_Vertex single poins with data as ( select 'Planar LineString to Point' as test, sdo_geometry('LINESTRING(0 0,10 10)',null) as geom, sdo_geometry('POINT(5 0)',null) as dGeom from dual union all select 'Geo LineString to Point' as test, sdo_geometry('LINESTRING(147.50 -43.132,147.41 -43.387)',4326) as geom, sdo_geometry('POINT(147.3 -43.2)',4326) as dGeom from dual union all select 'Planar CircularString to Point' as test, SDO_GEOMETRY(2002,28355,NULL, SDO_ELEM_INFO_ARRAY(1,2,2), -- Circular Arc line string SDO_ORDINATE_ARRAY(252230.478,5526918.373, 252400.08,5526918.373,252230.478,5527000.0)) as geom, SDO_GEOMETRY('POINT(252429.706 5527034.024)',28355) as dGeom from dual ) select a.test, T_Segment(a.geom).ST_Distance(p_vertex=>T_Vertex(a.dGeom),p_unit=>NULL) as d_in_meters, T_Segment(a.geom).ST_Distance(p_vertex=>T_Vertex(a.dGeom),p_unit=>'unit=KM') as l_in_km from data a; TEST D_IN_METERS L_IN_KM ------------------------------ ----------- ---------- Planar LineString to Point 3.535534 3.535534 Geo LineString to Point 13820.16185 13.820162 Planar CircularString to Point 42.61532 0.042615
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Equals [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Equals -- Compares current object (SELF) with supplied segment.
SYNOPSIS
Member Function ST_Equals(p_segment in &&INSTALL_SCHEMA..T_SEGMENT, p_coords In Integer default 1) Return Integer deterministic
DESCRIPTION
This function compares current segment object (SELF) to supplied segment (p_vertex).
If all ordinates (to supplied precision) are equal, returns True (1) else False (0).
SDO_GTYPE, SDO_SRID and ID are not compared uinless p_coords = 0
NOTES
To compare all 4 ordinates, use ST_Round on both segments before calling ST_Equals
ARGUMENTS
p_segment (T_Segment) -- Segment that is to be compared to current object (SELF).
p_coords (Integer) -- Boolean. If 1, only coordinates are compared; if 0, then all elements including segment_id etc are compared.
RESULT
BOOLEAN (INTEGER) - 1 is True (Equal); 0 is False.
EXAMPLE
set serveroutput on size unlimited
Declare
v_segment1 T_Segment;
v_segment2 T_Segment;
Begin
v_segment1 :=
T_Segment(
p_segment_id => 0,
p_startCoord => t_Vertex(
p_id=>1,
p_x=>0.0023763,
p_y=>0.18349,
p_z=>1.346,
p_w=>0.001,
p_sdo_gtype=>4401,
p_sdo_srid=>NULL
),
p_EndCoord => T_Vertex(
p_id=>2,
p_x=>10.87365,
p_y=>11.983645,
p_z=>1.984,
p_w=>14.386,
p_sdo_gtype=>4401,
p_sdo_srid=>NULL
),
p_sdo_gtype=>4402,
p_sdo_srid =>NULL
);
v_segment2 := T_Segment(v_segment1);
v_segment2.segment_id := 2;
dbms_output.put_line('Equals(With Metadata): ' ||
v_segment1.ST_Equals(p_segment =>v_segment2,
p_coords => 0 ));
dbms_output.put_line('Equals(Only Coords): ' ||
v_segment1.ST_Equals(p_segment =>v_segment2,
p_coords => 1 ));
END;
anonymous block completed
Equals(With Metadata): 0
Equals(Only Coords): 1
TODO
Consider extending to support precision for xy, z and W.
Need to do so in all other objects (T_Geometry currently only supports SELF.precision not SELF.precision XY/Z/W).
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_FindCircle [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_FindCircle -- Finds a centre X and Y and Radius from three points of underlying circular arc.
SYNOPSIS
Member Function ST_FindCircle (
DESCRIPTION
If the underlying object is a circular arc segment, then this function computes the centre and radius defining it.
If segment is not a circular arc, null is returned.
NOTES
Assumes planar projection eg UTM.
Works only on 2D circular segments
RESULT
Circle Properties (T_Vertex) : X ordinate of centre of circle.
Y ordinate of centre of circle.
Z ordinate contains radius of circle.
SRID as underlying T_SEGMENT.
EXAMPLE
-- Compute measure of point
with data as (
select 'LineString' as test,
sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,2),sdo_ordinate_array(0,0,5,5,10,0)) as geom
from dual
union all
select 'CircularString' as test,
SDO_GEOMETRY(2002,28355,NULL,
SDO_ELEM_INFO_ARRAY(1,2,2), -- Circular Arc line string
SDO_ORDINATE_ARRAY(252230.478,5526918.373, 252400.08,5526918.373,252230.478,5527000.0)) as geom
from dual
)
select a.test,
T_Segment(a.geom)
.ST_FindCircle()
.ST_AsText() as circle_params
from data a;
TEST CIRCLE_PARAMS
-------------- ----------------------------------------------------------
LineString T_Vertex(5,0,5,NULL,0,2001,NULL)
CircularString T_Vertex(252315.279,5526959.1865,94.111,NULL,0,2001,28355)
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_GetProjected [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_getProjected -- Rerturns whether underlying segment is planar/projected (1) or geographic/geodetic (0).
SYNOPSIS
Static Function ST_GetProjection
Return integer deterministic,
DESCRIPTION
This function can be used to discover whether the underlying SRID is projeccted/planar or not.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_hasM [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_hasM -- Tests segment to see if coordinates include a measure.
SYNOPSIS
Member Function ST_hasM
Return Integer Deterministic,
DESCRIPTION
Examines SDO_GTYPE (DLNN etc) to see if sdo_gtype has measure ordinate eg 3302 not 3002.
If SDO_GTYPE is null, examines coordinates to see if W ordinate is not null.
RESULT
BOOLEAN (INTEGER) -- 1 means segment has measure ordinate, 0 otherwise.
EXAMPLE
select T_Segment(sdo_geometry(3302,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5, -42.5,0.0, 147.6, -42.5, 10923.0))).ST_hasM() as hasM
from dual;
HASM
----
1
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_hasZ [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_hasZ -- Tests segment to see if coordinates include a Z ordinate.
SYNOPSIS
Member Function ST_hasZ
Return Integer Deterministic,
DESCRIPTION
Examines SDO_GTYPE (DLNN etc). If D position is 2 then segment does not have a Z ordinate.
If D position is 3 and measure ordinate position (L) is 0 then segment has Z ordinate.
If D position is 3 and measure ordinate position (L) is not equal to 0 then segment does not have a Z ordinate.
If D position is 4 and measure ordinate position (L) is equal to 0 or equal to D (4) then segment has a Z ordinate.
If D position is 4 and measure ordinate position (L) is equal to 3 then segment does not have a Z ordinate.
If SDO_GTYPE is null, examines Z and W ordinates of the segment's coordinates to determine if segment has Z ordinate.
RESULT
BOOLEAN (INTEGER) -- 1 means segment has Z ordinate, 0 otherwise.
EXAMPLE
select T_Segment(sdo_geometry(3002,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5, -42.5,10.0, 147.6, -42.5, 10.0))).ST_hasZ() as hasZ
from dual;
HASZ
----
1
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Intersect [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Intersect -- Computes intersection point between two 2D or 3D segments, returning a single intersection vertex.
SYNOPSIS
Member Function ST_Intersect(p_segment IN T_SEGMENT, p_unit IN varchar2 default NULL) Return T_Vertex Deterministic,
DESCRIPTION
This function computes the intersection point between the underlying 2D/3D segment and the provided 2D/3D segment.
The intersection point computed is always physical ie a physical intersection or an empty vertex is returned if no intersection is computed.
If segments are parallel an empty T_VERTEX is returned with T_VERTEX.id set to -9.
Intersection between a linestring segment and circular arc segment is supported.
However, the intersection between two circular arc segments is not yet supported.
INPUTS
p_segment (T_Segment) -- Second segment for which an intersection with current is computed.
p_unit (varchar2) -- Oracle Unit of Measure eg unit=M.
RESULT
Intersection (T_Vertex) -- The intersection point or empty point with id = -9 for parallel segments.
EXAMPLE
select T_Segment(
p_Segment_id => 0,
p_startCoord => T_Vertex(
p_id => 1,
p_x => 10,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_endCoord => T_Vertex(
p_id => 3,
p_x => 20,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_sdo_gtype => 2002,
p_sdo_srid => NULL
)
.ST_Intersect(p_segment =>
.ST_AsText() as Intersection3D
from dual;
INTERSECTION3D
------------------------------------
T_Vertex(10,5,NULL,NULL,1,2001,NULL)
-- ST_Intersect of line segment and circular arc segment
With data As (
SELECT SDO_GEOMETRY('CIRCULARSTRING(252230.478 5526918.373, 252400.08 5526918.373, 252230.478 5527000.0)',null) as cString,
SDO_GEOMETRY('LINESTRING(252257.745 5526951.808, 252438.138 5526963.252)',null) as lString
FROM Dual
)
select t_geometry(SDO_GEOM.SDO_Intersection(cString,lString,0.005),0.005,3,1)
.ST_Round(3,3,1)
.geom as iGeom,
T_Segment(lString)
.ST_Intersect(T_Segment(cString),3)
.ST_Round(3)
.ST_SdoGeometry() as iPoint
from data a;
IGEOM
IPOINT
-------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(2001,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,1,1),SDO_ORDINATE_ARRAY(252409.364,5526961.427))
SDO_GEOMETRY(2001,NULL, SDO_POINT_TYPE(252409.364,5526961.427,NULL),NULL,NULL)
-- ST_Intersect two 3D segments: No intersection in Z
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0,0, 500, 100,100,1000)) as line1,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(100,0,1000, 0,100, 501)) as line2
from dual
)
select f.intersection.ST_IsNull() as intersectAlwaysNull,
f.intersection.id as intersectMarker,
f.intersection.ST_AsText() as IntersectCoordValues
from (select T_Segment(line1)
.ST_Intersect(
T_Segment(line2)
) as intersection
from data a
) f;
INTERSECTALWAYSNULL INTERSECTMARKER INTERSECTCOORDVALUES
------------------- --------------- ----------------------------------------
1 -99 T_Vertex(NULL,NULL,NULL,NULL,-99,1,NULL)
-- ST_Intersect 3D has intersection in Z
-- Compare to SDO_GEOM.SDO_Intersection
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0, 0, 0, 100,100,10)) as line1,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,100,10, 100, 0, 0)) as line2
from dual
)
select sdo_geom.sdo_intersection(line1,line2,0.005) as geom from data
union all
select T_Segment(line1)
.ST_Intersect(
T_Segment(line2)
)
.ST_Round(3,3)
.ST_SdoGeometry(3) as int3D
from data a;
GEOM
---------------------------------------------------------------------------------------------
SDO_GEOMETRY(3001,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,1,1),SDO_ORDINATE_ARRAY(50,50,0))
SDO_GEOMETRY(3001,NULL, SDO_POINT_TYPE(50,50,5),NULL,NULL)
NOTES
Calculations are always planar.
3D computations use T_Vector3D object methods.
TODO
Enable calculation of intersection between geodetic/geographic segments.
Support intersections including circular arcs
AUTHOR
Simon Greener
HISTORY
Simon Greener - June 2011 - Original Coding
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Intersect2CircularArcs [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Intersect2CircularArcs -- Computes intersecton point between two 2D CircularArc segments.
SYNOPSIS
Member Function ST_Intersect2CircularArcs(
p_segment in &&INSTALL_SCHEMA..T_Segment,
p_unit in varchar2 default NULL)
Return &&INSTALL_SCHEMA..T_Segment Deterministic(
DESCRIPTION
This function computes the intersection point between the underlying circularArc segment and the provided circularArc segment.
If one of the segments is a LineString, ST_Intersect is called.
ARGUMENTS
p_segment (T_Segment) -- CircularArc Segment that is to be intersected with the current CircularArc object (SELF).
p_unit (varchar2) -- Oracle Unit of Measure for functions such as SDO_DISTANCE.
RESULT
intersection (T_Vertex) -- The intersection point.
EXAMPLE
select &&INSTALL_SCHEMA..t_segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,2),sdo_ordinate_array(0,0,10,10,20,0)))
.ST_Intersect2CircularArcs(
p_segment => &&INSTALL_SCHEMA..t_segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,2),SDO_ORDINATE_ARRAY(9.959,-0.004, 14.719,5.245, 8.133,13.623))),
p_unit => null)
.ST_Round(3) as intersection
from dual;
INTERSECTION
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
&&INSTALL_SCHEMA..T_SEGMENT(NULL,NULL,1,&&INSTALL_SCHEMA..T_VERTEX(14.477,8.942,NULL,NULL,1,2001,NULL,0),NULL,&&INSTALL_SCHEMA..T_VERTEX(1.189,4.729,NULL,NULL,3,2001,NULL,0),2002,NULL,1,&&INSTALL_SCHEMA..T_PRECISIONMODEL(3,3,3,0.005))
NOTES
Two intersections are returned for the two possible points where two circles defined by CircularArcs intersect.
Calculations are always planar.
TODO
Enable calculation of intersection between geodetic/geographic segments.
Return only the actual intersections.
AUTHOR
Simon Greener
HISTORY
Simon Greener - 2011 - Original Coding nuary 2018\
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_IntersectCircularArc [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_IntersectCircularArc -- Computes intersecton point between a CircularArc and a LineString segment.
SYNOPSIS
Member Function ST_IntersectCircularArc(
p_segment in &&INSTALL_SCHEMA..T_Segment,
p_unit in varchar2 default NULL)
Return &&INSTALL_SCHEMA..T_Segment Deterministic(
DESCRIPTION
This function computes the intersection point between a CircularArc and a LineString.
If both of the segments is a LineString, ST_Intersect is called.
ARGUMENTS
p_segment (T_Segment) -- CircularArc Segment that is to be intersected with the current CircularArc object (SELF).
p_unit (varchar2) -- Oracle Unit of Measure for functions such as SDO_DISTANCE.
RESULT
intersection (T_Vertex) -- The intersection point.
EXAMPLE
select &&INSTALL_SCHEMA..t_segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,2),sdo_ordinate_array(0,0,10,10,20,0)))
.ST_IntersectCircularArc(
p_segment => &&INSTALL_SCHEMA..t_segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),SDO_ORDINATE_ARRAY(10,0,10,12))),
p_unit => null)
.ST_Round(3)
.ST_SdoGeometry() as intersection
from dual;
INTERSECTION
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MDSYS.SDO_GEOMETRY(2002,NULL,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(10,-10,0,0))
NOTES
Two intersections are returned for the two possible points where two circles defined by CircularArcs intersect.
Calculations are always planar.
TODO
Fix as result is incorrect.
Enable calculation of intersection between geodetic/geographic segments.
Return only the actual intersections.
AUTHOR
Simon Greener
HISTORY
Simon Greener - 2011 - Original Coding nuary 2018\
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_IntersectDescription [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_IntersectDescription -- Interprets intersection that results from a call to STIntersectionDetail with same parameter values.
SYNOPSIS
Member Function ST_IntersectDescription(p_segment in T_SEGMENT, p_unit in varchar2 default NULL) Return T_Vertex Deterministic,
DESCRIPTION
Describes intersection point between two lines.
Internal code is same as STIntersectionDetail with same parameters so see its documentation.
Determines intersections as per STIntersectionDetail but determines nature of intersection ie whether physical, virtual, nearest point on segment etc.
Returned interpretation is one of:
Intersection at End 1 End 2
Intersection at End 1 Start 2
Intersection at Start 1 End 2
Intersection at Start 1 Start 2
Intersection within both segments
Parallel
Unknown
Virtual Intersection Near End 1 and End 2
Virtual Intersection Near End 1 and Start 2
Virtual Intersection Near Start 1 and End 2
Virtual Intersection Near Start 1 and Start 2
Virtual Intersection Within 1 and Near End 2
Virtual Intersection Within 1 and Near Start 2
Virtual Intersection Within 2 and Near End 1
Virtual Intersection Within 2 and Near Start 1
ARGUMENTS
p_segment (T_Segment) -- Segment that is to be intersections with current object (SELF).
p_unit (varchar2) -- Oracle Unit of Measure for functions such as SDO_DISTANCE.
RESULT
intersection (varchar2) -- Intersection description as in DESCRIPTION above.
EXAMPLE
select T_Segment(
p_Segment_id => 0,
p_startCoord => T_Vertex(
p_id => 1,
p_x => 10,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_endCoord => T_Vertex(
p_id => 3,
p_x => 20,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_sdo_gtype => 2002,
p_sdo_srid => NULL
)
.ST_IntersectDescription(p_segment =>
.ST_AsText() as Intersection
from dual;
INTERSECTION
------------------------------------
T_Vertex(10,5,NULL,NULL,1,2001,NULL)
select T_Segment(
sdo_geometry('LINESTRING(0 0,10 10)',null)
).ST_IntersectDescription(
T_Segment(
sdo_geometry('LINESTRING(0 10,10 0)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(5,5,NULL,NULL,0,2001,NULL),
Mid(5,5,NULL,NULL,-1,2001,NULL),
End(5,5,NULL,NULL,-2,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
-- Physical 1, virtual 2
select T_Segment(
sdo_geometry('LINESTRING(0 0,10 0)',null)
).ST_IntersectDescription(
T_Segment(
sdo_geometry('LINESTRING(-5 10,-2 7)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(5,0,NULL,NULL,0,2001,NULL),
Mid(5,0,NULL,NULL,-1,2001,NULL),
End(-2,7,NULL,NULL,-2,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
-- Virtual 1, Virtual 2
select T_Segment(
sdo_geometry('LINESTRING(10 10,5 5)',null)
).ST_IntersectDescription(
T_Segment(
sdo_geometry('LINESTRING(-10 10,-5 5)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(0,0,NULL,NULL,0,2001,NULL),
Mid(5,5,NULL,NULL,-1,2001,NULL),
End(-5,5,NULL,NULL,-2,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
-- Parallel
select T_Segment(
sdo_geometry('LINESTRING(10 10,0 10)',null)
).ST_IntersectDescription(
T_Segment(
sdo_geometry('LINESTRING(-10 5,-5 5)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(,,NULL,NULL,-9,2001,NULL),
Mid(,,NULL,NULL,NULL,2001,NULL),
End(,,NULL,NULL,NULL,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
NOTES
Calculations are always planar.
AUTHOR
Simon Greener
HISTORY
Simon Greener - March 2018 - Original TSQL Coding for SQL Server.
Simon Greener - June 2011 - Original Coding
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_IntersectDetail [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_IntersectDetail -- Computes intersecton point between two 2D segments.
SYNOPSIS
Member Function ST_IntersectDetail(p_segment in T_SEGMENT, p_unit in varchar2 default NULL) Return T_Vertex Deterministic,
DESCRIPTION
This function computes the intersection point between the underlying segment and the provided segment.
If segments are parallel an empty T_VERTEX is returned with T_VERTEX.id set to -9.
The intersection point is always returned in startCoord of returned T_Segment.
This version of ST_Intersect returns details about the nature of the Intersection.
These details include the coding of the returned midCoord and endCoords as follows:
1. If intersection is physical both are set to startCoord (cf ST_Intersect).
2. If intersection is physical in SELF but virtual in p_segment, midCoord is set to physical intersection point, and endCoord is set to projected (virtual) point from p_segment.
3. If intersection is physical in p_segment but virtual in SELF, midCoord is set to projected (virtual) point from SELF, and endCoord is set to physical intersection point in p_segment.
4. If intersection is virtual in p_segment and SELF, midCoord and endCoord are both set to virtual point (same as startCoord).
ARGUMENTS
p_segment (T_Segment) -- Segment that is to be intersections with current object (SELF).
p_unit (varchar2) -- Oracle Unit of Measure for functions such as SDO_DISTANCE.
RESULT
intersection (T_Vertex) -- The intersection point or empty point with id = -9 for parallel segments.
EXAMPLE
select T_Segment(
p_Segment_id => 0,
p_startCoord => T_Vertex(
p_id => 1,
p_x => 10,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_endCoord => T_Vertex(
p_id => 3,
p_x => 20,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_sdo_gtype => 2002,
p_sdo_srid => NULL
)
.ST_IntersectDetail(p_segment =>
.ST_AsText() as Intersection
from dual;
INTERSECTION
------------------------------------
T_Vertex(10,5,NULL,NULL,1,2001,NULL)
select T_Segment(
sdo_geometry('LINESTRING(0 0,10 10)',null)
).ST_IntersectDetail(
T_Segment(
sdo_geometry('LINESTRING(0 10,10 0)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(5,5,NULL,NULL,0,2001,NULL),
Mid(5,5,NULL,NULL,-1,2001,NULL),
End(5,5,NULL,NULL,-2,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
-- Physical 1, virtual 2
select T_Segment(
sdo_geometry('LINESTRING(0 0,10 0)',null)
).ST_IntersectDetail(
T_Segment(
sdo_geometry('LINESTRING(-5 10,-2 7)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(5,0,NULL,NULL,0,2001,NULL),
Mid(5,0,NULL,NULL,-1,2001,NULL),
End(-2,7,NULL,NULL,-2,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
-- Virtual 1, Virtual 2
select T_Segment(
sdo_geometry('LINESTRING(10 10,5 5)',null)
).ST_IntersectDetail(
T_Segment(
sdo_geometry('LINESTRING(-10 10,-5 5)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(0,0,NULL,NULL,0,2001,NULL),
Mid(5,5,NULL,NULL,-1,2001,NULL),
End(-5,5,NULL,NULL,-2,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
-- Parallel
select T_Segment(
sdo_geometry('LINESTRING(10 10,0 10)',null)
).ST_IntersectDetail(
T_Segment(
sdo_geometry('LINESTRING(-10 5,-5 5)',null)
)
).ST_AsText() as iPoint
from dual;
IPOINT
-----------------------------------------
SEGMENT(NULL,NULL,1,
Start(,,NULL,NULL,-9,2001,NULL),
Mid(,,NULL,NULL,NULL,2001,NULL),
End(,,NULL,NULL,NULL,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
NOTES
Calculations are always planar.
TODO
Enable calculation of intersection between geodetic/geographic segments.
Support intersections including circular arcs
AUTHOR
Simon Greener
HISTORY
Simon Greener - June 2011 - Original Coding
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_isCircularArc [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_isCircularArc -- Checks if segment is a CircularArc
SYNOPSIS
Member Function ST_isCircularArc
Return Integer Deterministic,
DESCRIPTION
If segment start/mid/end coordinates are all not null then is CircularString.
RESULT
BOOLEAN (INTEGER) -- 1 if segment is CircularArc.
EXAMPLE
with data as (
select T_Segment(
SDO_GEOMETRY('CIRCULARSTRING(252230.478 5526918.373, 252400.08 5526918.373, 252230.478 5527000.0)',null)
) as circular_segment
from dual
)
select a.circular_segment.ST_isCircularArc() as isCString
from data a;
ISCSTRING
---------
1
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2018 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_isCollinear [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_isCollinear -- Checks if two segments' coordinates are collinar.
SYNOPSIS
Member Function ST_isCollinear(p_segment in &&INSTALL_SCHEMA..T_SEGMENT) Return Integer Deterministic
DESCRIPTION
This function determines if the two segments (underlying and supplied) have coordinates that fall in a line (collinear)
The segments should touch with a end/start relationship.
Supplied segments cannot be CircularArcs.
ARGUMENTS
p_segment (T_Segment) -- Other, possibly connected, segment (LineString not CircularString)
RESULT
boolean (integer) -- 1 is true (collinear) 0 if false.
NOTES
Ignores any measure ordinates.
Calculations are always planar.
EXAMPLE
-- 0. Uses T_Vector3D to compute whether segments can be merged by sharing vertex and having same normalized vectors.
with data as (
select sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0, 0, 100,100)) as line1,
sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(100,100, 200,200)) as line2
from dual
UNION ALL
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0, 0, 0, 100,100,10)) as line1,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(100,100,10, 200,200,20)) as line2
from dual
)
select T_Segment(a.line1)
.ST_IsCollinear(p_segment=>T_Segment(a.line2)) as isCollinear
from data a;
MS2
----------------
0
1
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 -- Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_isEmpty [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_isEmpty -- Checks if segment has any valid data.
SYNOPSIS
Member Function ST_isEmpty
Return INTEGER Deterministic,
DESCRIPTION
If segment object data values are NULL returns 1 (TRUE) ie is Empty; else 0 (False)
cf "LINESTRING EMPTY" EKT.
RESULT
BOOLEAN (INTEGER) -- 1 if segment has no non null values; 0 if has values
EXAMPLE
select T_Segment().ST_AsText() as TSegment, T_Segment().ST_isEmpty() as isEmpty from dual; TSEGMENT -------------------------------------------------------------------------------------------------------------------------------------- -------- SEGMENT(NULL,NULL,NULL,Start(NULL,NULL,NULL,NULL,NULL,2001,NULL),End(NULL,NULL,NULL,NULL,NULL,2001,NULL),SDO_GTYPE=2002,SDO_SRID=NULL) 0
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_isHorizontal [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_isHorizontal - Returns true if the segment is horizonal or parallel to X axis.
SYNOPSIS
Member Function ST_isHorizontal
Return integer Determinsitic
DESCRIPTION
Supplied with a non-NULL segment, this function checks if segment is horizontal or parallel to X axis
RESULT
true/false (integer) -- 1 is horizontal 0 otherwise
EXAMPLE
select T_Segment(sdo_geometry('LINESTRING(0 0,10 0)',NULL)).ST_isHorizontal() as isHorizontal
from dual;
ISHORIZONTAL
------------
1
select T_Segment(sdo_geometry('LINESTRING(0 0,10 10)',NULL)).ST_isHorizontal() as isHorizontal
from dual;
ISHORIZONTAL
------------
0
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_isPointOnSegment [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_isPointOnSegment -- Checks if supplied point falls on the underlying segment.
SYNOPSIS
ST_isPointOnSegment(p_vertex in &&INSTALL_SCHEMA..T_Vertex,
p_unit in varchar2)
Return integer deterministic
DESCRIPTION
This function checks if the supplied point falls on the underlying segment.
Computes for LineString or CircularString.
NOTES
Geodetic/geographic CircularArc segments treated as planar
INPUTS
p_vertex (t_vertex) - Point on to linestring or CircularString.
p_unit (varchar2) - Unit of measure for SRID.
RESULT
booelan (integer) -- 1 if point on segment; 0 otherwise
EXAMPLE
select T_Segment(MDSYS.SDO_GEOMETRY(3302,8307,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(147.41,-43.132,100, 147.5,-43.387,30000)))
.ST_isPointOnSegment (
t_vertex(SDO_GEOMETRY(3301,8307,SDO_POINT_TYPE(147.44551945,-43.23290209,11930.116),NULL,NULL))
) as is_on
from dual union all
select T_Segment(MDSYS.SDO_GEOMETRY(3302,8307,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(147.41,-43.132,100, 147.5,-43.387,30000)))
.ST_isPointOnSegment (
t_vertex(SDO_GEOMETRY(3301,8307,SDO_POINT_TYPE(147.445,-43.232,11930.116),NULL,NULL))
) as is_on
from dual;
IS_ON
----------
1
0
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2019 - Original coding.
COPYRIGHT
(c) 2008-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_isReversed [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_isReversed -- Returns 1 (true) if the underlying segment has its start/end coordinates reversed to supplied segment.
SYNOPSIS
Member Function ST_isReversed(p_other IN &&INSTALL_SCHEMA..T_SEGMENT) Return Integer Deterministic,
DESCRIPTION
Compares underlying T_SEGMENT's start and end coordinates against those of the supplied segment parameter. If self.start = p_other.end and self.end = p_other.start, the function returns 1 (True) otherwise 0 (False). If SDO_GTYPE is null, examines coordinates to see if W ordinate is not null.
ARGUMENTS
p_other (T_Segment) -- Compared to SELF with return of 1 if reversed start/end coordinates
RESULT
True/False (Integer) -- 1 if two segments have opposite direction.
select T_Segment(
sdo_geometry('LINESTRING(0 0,10 10)',null)
).ST_isReversed(
p_other =>T_Segment(sdo_geometry('LINESTRING(10 10,0 0)',null))
) as isReversed
from dual;
ISREVERSED
----------
1
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_isVertical [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_isVertical - Returns true if the segment is Vertical or parallel to Y axis.
SYNOPSIS
Member Function ST_isVertical
Return integer Determinsitic
DESCRIPTION
Supplied with a non-NULL segment, this function checks if segment is vertical or parallel to Y axis
RESULT
true/false (integer) -- 1 is Vertical 0 otherwise
EXAMPLE
select T_Segment(sdo_geometry('LINESTRING(0 0,0 10)',NULL)).ST_isVertical() as isVertical
from dual;
ISVERTICAL
----------
1
select T_Segment(sdo_geometry('LINESTRING(0 0,10 10)',NULL)).ST_isVertical() as isVertical
from dual;
ISVERTICAL
----------
0
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Length [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Length -- Returns Length of the segment
SYNOPSIS
Member Function ST_Length(p_unit in varchar2 DEFAULT NULL)
Return Number Deterministic
DESCRIPTION
This function computes a length from the underlying T_SEGMENT. Result is in the distance units of the SDO_SRID, or in p_units where supplied.
ARGUMENTS
p_unit (VARCHAR2) - Oracle Unit of Measure eg unit=M.
RESULT
distance (Number) -- Distance in SRID unit of measure or in supplied units (p_unit)
EXAMPLE
TO DO
-- Simple length for mixed planar and geodetic data
with data as (
select 'Planar LineString' as test, sdo_geometry('LINESTRING(0 0,10 10)',null) as geom
from dual
union all
select 'Geo LineString' as test, sdo_geometry('LINESTRING(147.50 -43.132,147.41 -43.387)',4326) as geom
from dual
union all
select 'Planar CircularString' as test,
SDO_GEOMETRY(2002,28355,NULL,
SDO_ELEM_INFO_ARRAY(1,2,2), -- Circular Arc line string
SDO_ORDINATE_ARRAY(252230.478,5526918.373, 252400.08,5526918.373,252230.478,5527000.0)) as geom
from dual
)
select a.test,
T_Segment(a.geom).ST_Length(p_unit=>NULL) as l_in_meters,
T_Segment(a.geom).ST_Length(p_unit=>'unit=KM') as l_in_km
from data a;
TEST L_IN_METERS L_IN_KM
--------------------- ----------- ----------
Planar LineString 14.14213562 14.14213562
Geo LineString 29257.27111 29.25727111
Planar CircularString 506.8892138 0.5068892138
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_LineSubstring [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_LineSubstring -- Creates a new segment by cutting out the line defined by p_start_fraction and p_end_fraction.
SYNOPSIS
Member Function ST_LineSubstring(p_start_fraction In Number Default 0.0,
p_end_fraction In Number Default 1.0,
p_unit In Varchar2 Default NULL)
Return &&INSTALL_SCHEMA..T_Segment Deterministic
DESCRIPTION
Supplied with two ratio values between (0.0 -> 1.0), this function uses those values to find the
points along its segment where they lie. If offset values of 0.0 and 1.0 are supplied, the underlying
segment is returned. Otherwise, the function finds the position of the point defined by p_start_fraction
and the point defined by p_end_fraction and creates a new segment based on those points.
For circular arcs a new midCoord is created at position p_start_fraction + (p_end_fraction-p_start_Fraction)/2.0.
If p_start_fraction == p_end_fraction a single point is returned in the T_Segment's startCoord with the others being NULL.
The substring operation uses length and not LRS measure.
Any Z and M ordinates are calculated by ratio.
ARGUMENTS
p_start_fraction (Number) -- A value between 0 and 1, from the start vertex of the segment,
which describes the position of the first point in the substring.
p_end_fraction (Number) -- A value > p_start_fraction, from the start vertex of the segment,
which describes the position of the last point in the substring.
p_unit (Varchar2) -- If NULL, the calculations are done using the underlying projection default units.
If an Oracle Unit of Measure is supplied (eg unit=M) that is value for the SRID,
this value is used when calculating the p_offset distance.
RESULT
segment (T_Segment) - - New segment between the start and end measures.
EXAMPLE
-- Substring of XYZ LineString.
With data as (
select SDO_GEOMETRY(3002,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),
SDO_ORDINATE_ARRAY(562046.642,1013077.602,0, 562032.193,1013252.074,0.035)) as geom
from dual
)
select T_Segment(a.geom)
.ST_LineSubstring(p_start_fraction => 0.25,
p_end_fraction => 0.75,
p_unit => 'unit=M'
)
.ST_Round(3)
.ST_SdoGeometry() as substring
from data a;
SUBSTRING
---------------------------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(3302,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(562043.03,1013121.22,0.009,562035.805,1013208.456,0.026))
-- Fractions equal...
With data as (
select SDO_GEOMETRY(3302,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),
SDO_ORDINATE_ARRAY(562046.642,1013077.602,0, 562032.193,1013252.074,0.035)) as geom
from dual
)
select T_Segment(a.geom)
.ST_LineSubstring(p_start_fraction => 0.5,
p_end_fraction => 0.5,
p_unit => 'unit=M'
)
.ST_Round(3)
.ST_SdoGeometry() as substring
from data a;
SUBSTRING
----------------------------------------------------------------------------------
SDO_GEOMETRY(3301,90000006,SDO_POINT_TYPE(562039.418,1013164.838,0.018),NULL,NULL)
-- Geodetic.
With data as (
select sdo_geometry(2002,4326,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.50,-43.132,147.41,-43.387)) as geom
from dual
union all
select sdo_geometry(3302,4326,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.50,-43.132,100.0,147.41,-43.387,30000.0)) as geom
from dual
union all
select sdo_geometry(3002,4326,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.50,-43.132,100.0, 147.41,-43.387,30000.0)) as geom
from dual
)
select T_Segment(a.geom)
.ST_LineSubstring(p_start_fraction => 0.5,
p_end_fraction => 0.9,
p_unit => 'unit=M'
)
.ST_Round(8)
.ST_SdoGeometry() as substring
from data a;
SUBSTRING
-------------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(2002,4326,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.455,-43.2595,147.419,-43.3615))
SDO_GEOMETRY(3302,4326,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.455,-43.2595,15050,147.419,-43.3615,27010))
SDO_GEOMETRY(3002,4326,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.455,-43.2595,15050,147.419,-43.3615,27010))
-- Circular Arc line string
With data as (
select sdo_geometry(2002,NULL,NULL,
sdo_elem_info_array(1,2,2),
sdo_ordinate_array(252230.478,5526918.373, 252400.08,5526918.373,252230.478,5527000.0)) as geom
from dual
)
select T_Segment(a.geom)
.ST_LineSubstring(p_start_fraction => 0.25,
p_end_fraction => 0.75,
p_unit => 'unit=M'
)
.ST_Round(3)
.ST_SdoGeometry() as substring
from data a;
SUBSTRING
------------------------------------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252256.627,5527032.786,252373.991,5527032.738,252400.046,5526918.303))
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2018 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_LRS_Add_Measure [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_LRS_Add_Measure -- Adds measures to 2D segment linestring/circularString
SYNOPSIS
Member Function ST_LRS_Add_Measure(p_start_measure IN Number Default NULL,
p_end_measure IN Number Default NULL,
p_unit IN VarChar2 Default NULL)
Return &&INSTALL_SCHEMA..T_Segment deterministic,
DESCRIPTION
Takes a 2D geometry and assigns supplied measures to the start/end vertices
and adds proportioned measure values to all vertices in between.
If p_start_measure/p_end_measure are null, length is used to add measures.
ARGUMENTS
p_start_measure (Number) - Measure defining start point for segment .
p_end_measure (Number) - Measure defining end point for segment.
p_unit (VarChar2) - Unit of measure for distance calculations.
RESULT
segment (T_segment) -- Measured segment
EXAMPLE
select t_geometry(SDO_GEOMETRY(2002,28355,NULL,
SDO_ELEM_INFO_ARRAY(1,2,1),
SDO_ORDINATE_ARRAY(
571303.231,321126.963, 571551.298,321231.412, 572765.519,321322.805, 572739.407,321845.051,
572752.463,322641.476, 573209.428,323398.732, 573796.954,323555.406, 574436.705,323790.416,
574945.895,324051.539, 575128.681,324652.122, 575128.681,325161.311, 575898.993,325213.536,
576238.453,324521.56, 576251.509,321048.626, 575259.242,322615.364, 574306.144,321296.693)),
0.0005,3,1)
.ST_LRS_ADD_Measure(110.0)
.ST_Round(3,3,1,2)
.geom as mGeom
from dual;
MGEOM
---------------------------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(3302,28355,NULL,
SDO_ELEM_INFO_ARRAY(1,2,1),
SDO_ORDINATE_ARRAY(
571303.231,321126.963,110.0, 571551.298,321231.412,377.21, 572765.519,321322.805,1586.05, 572739.407,321845.051,2105.16,
572752.463,322641.476,2895.92, 573209.428,323398.732,3773.96, 573796.954,323555.406,4377.62, 574436.705,323790.416,5054.23,
574945.895,324051.539,5622.33, 575128.681,324652.122,6245.56, 575128.681,325161.311,6751.06, 575898.993,325213.536,7517.55,
576238.453,324521.56,8282.72, 576251.509,321048.626,11730.53, 575259.242,322615.364,13571.62, 574306.144,321296.693,15186.88))
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original Coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_LRS_Compute_Measure [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_LRS_Compute_Measure -- Computes measure for supplied p_vertex against underlying LRS measured T_SEGMENT.
SYNOPSIS
Member Function ST_LRS_Compute_Measure(p_vertex In &&INSTALL_SCHEMA..T_Vertex,
p_unit IN varchar2 Default null)
Return Number Deterministic
DESCRIPTION
This function computes a measure value for the supplied point (must be a point
on the underlying segment). All calculations are done on 2D versions of segment
and point.
ARGUMENTS
p_vertex (T_VERTEX) - Finds p_vertex on LRS Segment and computes M ordinate p_unit (VARCHAR2) - Oracle Unit of Measure eg unit=M.
RESULT
-- Compute measure of point
with data as (
select 'Planar LineString' as test,
sdo_geometry(3302,NULL,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(1,1,1.1,6,6,5.95)) as geom,
sdo_geometry('POINT(5 4.9)',null) as dGeom
from dual
union all
select 'Geo LineString' as test,
sdo_geometry(3302,4326,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.50,-43.132,100.0,147.41,-43.387,30000.0)) as geom,
sdo_geometry('POINT(147.3 -43.2)',4326) as dGeom
from dual
)
select a.test,
T_Segment(a.geom).ST_LRS_Compute_Measure(p_vertex=>T_VERTEX(a.dGeom),p_unit=>NULL) as measure
from data a;
TEST MEASURE
----------------- ----------
Planar LineString 4.93180695
Geo LineString 18427.043
TODO
Support CircularString (Circular Arcs).
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_LRS_Dim [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_LRS_Dim -- Tests segment to see if coordinates include a measure ordinate and returns measure ordinate's position.
SYNOPSIS
Member Function ST_LRS_Dim
Return Integer Deterministic,
DESCRIPTION
Examines SDO_GTYPE (DLNN etc) measure ordinate position (L) and returns it.
If SDO_GTYPE is null, examines coordinates to see if W ordinate is not null.
RESULT
dimension (integer) -- L from DLNN.
EXAMPLE
select T_Segment(sdo_geometry(3302,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5, -42.5,0.0, 147.6, -42.5, 10923.0))).ST_LRS_Dim() as lrs_dim
from dual;
LRS_DIM
-------
3
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_LRS_isMeasured [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_LRS_isMeasured -- Tests to see if segment is measured.
SYNOPSIS
Member Function ST_LRS_isMeasured
Return Integer Deterministic,
With data as (
Select T_GEOMETRY(sdo_geometry('LINESTRING(0 0,10 0,10 5,10 10,5 10,5 5)',null),0.005,3,1) as tgeom From Dual UNION ALL
Select T_GEOMETRY(sdo_geometry(3002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0,0,1,10,0,2,10,5,3,10,10,4,5,10,5,5,5,6)),0.005,3,1) as tgeom From Dual UNION ALL
Select T_GEOMETRY(sdo_geometry(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0,0,1,10,0,2,10,5,3,10,10,4,5,10,5,5,5,6)),0.005,3,1) as tgeom From Dual
)
select a.tgeom.ST_GType() as sdo_gtype,
a.tgeom.ST_LRS_isMeasured() as isMeasured
from data a;
SDO_GTYPE GEOMTYPE COORDDIM isMeasured
--------- -------------- -------- ----------
2 ST_LINESTRING 2 0
2 ST_LINESTRING 3 0
2 ST_LINESTRING 3 1
DESCRIPTION
Examines SDO_GTYPE (ST_LRS_Dim) to see if sdo_gtype has measure ordinate eg 3302 not 3002.
RESULT
BOOLEAN (Integer) -- 1 is measure ordinate exists, 0 otherwise.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_LRS_Measure_Length [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_LRS_Measure_Length -- Returns difference between end measure and start measure of segment.
SYNOPSIS
Member Function ST_LRS_Measure_Length( p_unit IN VARCHAR2 Default NULL )
Return Number Deterministic
DESCRIPTION
This function computes length by subtracting end and start measure ordinates.
If segment is without measures length is returned.
RESULT
distance (Number) -- Difference between end and start measure ordinates (delta) or segment length.
EXAMPLE
with data as (
select 'Planar LineString' as test,
sdo_geometry(3302,NULL,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(1,1,1.1,6,6,5.95)) as geom
from dual
union all
select 'Geo LineString' as test,
sdo_geometry(3302,4326,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.50,-43.132,100.0,147.41,-43.387,30000.0)) as geom
from dual
)
select a.test,
T_Segment(a.geom)
.ST_LRS_Measure_Length() as measureLength
from data a;
TEST MEASURELENGTH
----------------- -------------
Planar LineString 4.85
Geo LineString 29900
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_MaxX [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_MaxX - Returns the largest X ordinate value from the underlying segments minimum bounding rectangle (MBR).
SYNOPSIS
Member Function ST_MaxX
Return SDO_GEOMETRY Determinsitic
DESCRIPTION
Supplied with a non-NULL segment, this function returns the largest X ordinate value held by the startCoord,midCoord or endCoord vertices.
RESULT
ordinate (number) -- Largest x ordinate value
EXAMPLE
select T_Segment(sdo_geometry('LINESTRING(0 0,0.8 0.8)',NULL)).ST_MaxX() as maxX
from dual;
MAXX
----
0.8
SEE ALSO
T_MBR object.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2011 - Original coding
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_MaxY [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_MaxY - Returns the largest Y ordinate value from the underlying segments minimum bounding rectangle (MBR).
SYNOPSIS
Member Function ST_MaxY
Return SDO_GEOMETRY Determinsitic
DESCRIPTION
Supplied with a non-NULL segment, this function returns the largest Y ordinate value held by the startCoord,midCoord or endCoord vertices.
RESULT
ordinate (number) -- Largest x ordinate value
EXAMPLE
select T_Segment(sdo_geometry('LINESTRING(0 0,0.8 0.8)',NULL)).ST_MaxY() as maxX
from dual;
MAXX
----
0.8
SEE ALSO
T_MBR object.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2011 - Original coding
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_MBR [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_MBR - Returns optimized rectangle sdo_geometry representnig the underlying segment's minimum bounding rectangle (MBR).
SYNOPSIS
Member Function ST_MBR
Return SDO_GEOMETRY Determinsitic
EXAMPLE
select T_Segment(sdo_geometry('LINESTRING(0 0,0.8 0.8)',NULL)).ST_MBR() as mbrGeom
from dual;
MBRGEOM
--------------------------------------------------------------------------------------
SDO_GEOMETRY(2003,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,1003,3),SDO_ORDINATE_ARRAY(0,0,0.8,0.8))
DESCRIPTION
Supplied with a non-NULL segment, this function returns the envelope or minimum bounding rectangle as a polygon geometry with one optimized rectangle exterior ring.
RESULT
MBR Geometry (sdo_geometry) -- Single Polygon with Optimized Rectangle Exterior Ring.
SEE ALSO
T_MBR object.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2011 - Converted to T_GEOMETRY from GEOM package.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Merge [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Merge -- Merge two straight line segments - does not support circular arc segments
SYNOPSIS
Member Function ST_Merge(p_segment in &&INSTALL_SCHEMA..T_SEGMENT) Return t_segment Deterministic
DESCRIPTION
This function determines if the two segments (underlying and supplied) for a straight line (no bend)
and touch as a start/end coordinate pair.
New segment is created from start/end coordinates.
ARGUMENTS
p_segment (T_Segment) -- Other, possibly connected, segment
RESULT
segment (T_Segment) -- New segment.
NOTES
Ignores any measure ordinates.
Calculations are always planar.
EXAMPLE
-- 0. Uses T_Vector3D to compute whether segments can be merged by sharing vertex and having same normalized vectors.
with data as (
select sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0, 0, 100,100)) as line1,
sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(100,100, 200,200)) as line2
from dual
UNION ALL
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0, 0, 0, 100,100,10)) as line1,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(100,100,10, 200,200,20)) as line2
from dual
)
select a.line1.get_Dims() as dims,
t_vector3d(T_Segment(a.line1))
.Normalize()
.Subtract(
t_vector3d(
T_Segment(a.line2))
.Normalize())
.AsText()as ms2
from data a;
DIMS MS2
---- ----------------
2 T_VECTOR3D(x=0,y=0,z=NULL}
3 T_VECTOR3D(x=0,y=0,z=0}
-- 1. ST_Merge End/Start collinear in 2D and 3D
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0, 0, 0, 10,10,10)) as first_line,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(10,10,10, 20,20,20)) as second_line
from dual
)
select 2 as dims,
T_Segment( a.first_line, 1 ).ST_To2D()
.ST_Merge( T_Segment( a.second_line, 2 ).ST_To2D() ).ST_AsText() as mergedSegment
from data a
union all
select 3 as dims,
T_Segment( a.first_line, 1 ).ST_Merge( T_Segment( a.second_line, 2 ) ).ST_AsText() as mergedSegment
from data a;
DIMS MERGEDSEGMENT
---- -------------------------------------------------------------------------------------------------------------------
2 SEGMENT(NULL,NULL,1,Start(1,0,0,NULL,NULL,2001,NULL),End(2,20,20,NULL,NULL,2001,NULL),SDO_GTYPE=2002,SDO_SRID=NULL)
3 SEGMENT(NULL,NULL,1,Start(1,0,0,0,NULL,3001,NULL),End(2,20,20,20,NULL,3001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
-- 2. ST_Merge End/Start collinear in 2D but not 3D
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0, 0, 0, 10,10,10)) as first_line,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(10,10,10, 20,20,21)) as second_line
from dual
)
select 2 as dims,
T_Segment( a.first_line, 1 ).ST_To2D()
.ST_Merge( T_Segment( a.second_line, 2 ).ST_To2D() ).ST_AsText() as mergedSegment
from data a
union all
select 3 as dims,
T_Segment( a.first_line ).ST_Merge( T_Segment( a.second_line, 2 ) ).ST_AsText() as mergedSegment
from data a;
DIMS MERGEDSEGMENT
---- ---------------------------------------------------------------------------------------------------------------------------------------------
2 SEGMENT(NULL,NULL,1,Start(1,0,0,NULL,NULL,2001,NULL),End(2,20,20,NULL,NULL,2001,NULL),SDO_GTYPE=2002,SDO_SRID=NULL)
3 SEGMENT(NULL,NULL,0,Start(1,0,0,0,NULL,3001,NULL),Mid(2,10,10,10,NULL,3001,NULL),End(2,20,20,21,NULL,3001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
-- 3. ST_Merge where relationship is end/end collinear
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array( 0, 0, 0, 10,10,10)) as first_line,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(20,20,20, 10,10,10)) as second_line
from dual
)
select 2 as dims,
T_Segment( a.first_line, 1 ).ST_To2D()
.ST_Merge( T_Segment( a.second_line, 2 ).ST_To2D() ).ST_AsText() as mergedSegment
from data a
union all
select 3 as dims,
T_Segment( a.first_line, 1 ).ST_Merge( T_Segment( a.second_line, 2 ) ).ST_AsText() as mergedSegment
from data a;
DIMS MERGEDSEGMENT
---- -------------------------------------------------------------------------------------------------------------------
2 SEGMENT(NULL,NULL,1,Start(1,0,0,NULL,NULL,2001,NULL),End(1,20,20,NULL,NULL,2001,NULL),SDO_GTYPE=2002,SDO_SRID=NULL)
3 SEGMENT(NULL,NULL,1,Start(1,0,0,0,NULL,3001,NULL),End(1,20,20,20,NULL,3001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
-- 4. ST_Merge where relationship is start/start collinear
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(10,10,10, 0, 0, 0)) as first_line,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(20,20,20, 10,10,10)) as second_line
from dual
)
select 2 as dims,
T_Segment( a.first_line, 1 ).ST_To2D()
.ST_Merge( T_Segment( a.second_line, 2 ).ST_To2D() ).ST_AsText() as mergedSegment
from data a
union all
select 3 as dims,
T_Segment( a.first_line, 1 ).ST_Merge( T_Segment( a.second_line, 2 ) ).ST_AsText() as mergedSegment
from data a;
DIMS MERGEDSEGMENT
---- --------------------------------------------------------------------------------------------------------------------------------------
2 SEGMENT(NULL,NULL,NULL,Start(NULL,NULL,NULL,NULL,NULL,NULL,NULL),End(NULL,NULL,NULL,NULL,NULL,NULL,NULL),SDO_GTYPE=NULL,SDO_SRID=NULL)
3 SEGMENT(NULL,NULL,NULL,Start(NULL,NULL,NULL,NULL,NULL,NULL,NULL),End(NULL,NULL,NULL,NULL,NULL,NULL,NULL),SDO_GTYPE=NULL,SDO_SRID=NULL)
-- 5. ST_Merge where identical (returns first_line)
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,0,0, 10,10,10)) as first_line,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,0,0, 10,10,10)) as second_line
from dual
)
select 2 as dims,
T_Segment( a.first_line, 1 ).ST_To2D()
.ST_Merge( T_Segment( a.second_line, 2 ).ST_To2D() ).ST_AsText() as mergedSegment
from data a
union all
select 3 as dims,
T_Segment( a.first_line, 1 ).ST_Merge( T_Segment( a.second_line, 2 ) ).ST_AsText() as mergedSegment
from data a;
DIMS MERGEDSEGMENT
---- -------------------------------------------------------------------------------------------------------------------
2 SEGMENT(NULL,NULL,1,Start(1,0,0,NULL,NULL,2001,NULL),End(2,10,10,NULL,NULL,2001,NULL),SDO_GTYPE=2002,SDO_SRID=NULL)
3 SEGMENT(NULL,NULL,1,Start(1,0,0,0,NULL,3001,NULL),End(2,10,10,10,NULL,3001,NULL),SDO_GTYPE=3002,SDO_SRID=NULL)
-- 6. ST_Merge where no spatial relationship (Returns Empty Segment)
with data as (
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,0,0, 10,10,10)) as first_line,
sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(11,11,11, 20,20,21)) as second_line
from dual
)
select 2 as dims,
T_Segment( a.first_line, 1 ).ST_To2D()
.ST_Merge( T_Segment( a.second_line, 2 ).ST_To2D() ).ST_AsText() as mergedSegment
from data a
union all
select 3 as dims,
T_Segment( a.first_line, 1 ).ST_Merge( T_Segment( a.second_line, 2 ) ).ST_AsText() as mergedSegment
from data a;
DIMS MERGEDSEGMENT
---- --------------------------------------------------------------------------------------------------------------------------------------
2 SEGMENT(NULL,NULL,NULL,Start(NULL,NULL,NULL,NULL,NULL,NULL,NULL),End(NULL,NULL,NULL,NULL,NULL,NULL,NULL),SDO_GTYPE=NULL,SDO_SRID=NULL)
3 SEGMENT(NULL,NULL,NULL,Start(NULL,NULL,NULL,NULL,NULL,NULL,NULL),End(NULL,NULL,NULL,NULL,NULL,NULL,NULL),SDO_GTYPE=NULL,SDO_SRID=NULL)
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 -- Original coding.
Simon Greener - August 2018 -- Ensure all cases correct esp for 3D (XYZ)
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_MidPoint [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_MidPoint - Computes, and returns, the midpoint of the segment
SYNOPSIS
Member Function ST_MidPoint
Return t_vertex Determinsitic
DESCRIPTION
Supplied with a non-NULL segment, this function computes and returns its mid Point.
If CircularArc, mid point is point at mid length distance from start.
RESULT
point (t_vertex) -- The midpoint of the segment
EXAMPLE
select &&INSTALL_SCHEMA..T_Segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,0,1,1)))
.ST_midPoint()
.ST_SdoGeometry() as mPoint
from dual;
MPOINT
--------------------------------------------------------------------
SDO_GEOMETRY(2001, NULL, SDO_POINT_TYPE(0.5, 0.5, NULL), NULL, NULL)
select &&INSTALL_SCHEMA..T_Segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,2),sdo_ordinate_array(0,0,10,10,20,0)))
.ST_midPoint()
.ST_SdoGeometry() as mPoint
from dual;
MPOINT
------------------------------------------------------------------
SDO_GEOMETRY(2001, NULL, SDO_POINT_TYPE(10, 10, NULL), NULL, NULL)
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_MinX [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_MinX - Returns the smallest X ordinate value from the underlying segments minimum bounding rectangle (MBR).
SYNOPSIS
Member Function ST_MinX
Return SDO_GEOMETRY Determinsitic
DESCRIPTION
Supplied with a non-NULL segment, this function returns the smallest X ordinate value held by the startCoord,midCoord or endCoord vertices.
RESULT
ordinate (number) -- Smallest
EXAMPLE
select T_Segment(sdo_geometry('LINESTRING(0 0,0.8 0.8)',NULL)).ST_MinX() as minX
from dual;
MINX
----
0
SEE ALSO
T_MBR object.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2011 - Original coding
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_MinY [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_MinY - Returns the smallest Y ordinate value from the underlying segments minimum bounding rectangle (MBR).
SYNOPSIS
Member Function ST_MinY
Return SDO_GEOMETRY Determinsitic
DESCRIPTION
Supplied with a non-NULL segment, this function returns the smallest Y ordinate value held by the startCoord,midCoord or endCoord vertices.
RESULT
ordinate (number) -- Smallest
EXAMPLE
select T_Segment(sdo_geometry('LINESTRING(0 0,0.8 0.8)',NULL)).ST_MinY() as minX
from dual;
MINY
----
0
SEE ALSO
T_MBR object.
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2011 - Original coding
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_OffsetBetween [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_OffsetBetween - Computes offset point on the bisector between two vertices.
SYNOPSIS
Member Function ST_OffsetBetween(p_segment in number,
p_offset in number,
p_unit In Integer Default NULL)
Return &&INSTALL_SCHEMA..T_Vertex Deterministic
DESCRIPTION
Supplied with a second segment (p_segment), this function computes the bisector
between the two segments and then creates a new vertex at a distance of p_offset
from the intersection point. If an offset value of 0.0 is supplied, the
intersection point is returned. If the p_offset value is <> 0, the function computes a new
position for the point at a distance of p_offset on the left (-ve) or right (+ve) side
of the segment.
The returned vertex's ordinate values are rounded using the supplied tolerance.
ARGUMENTS
p_segment (number) - A segment that touches the current segment at one end point.
p_offset (number) - The perpendicular distance to offset the point generated using p_ratio.
A negative value instructs the function to offet the point to the left (start-end),
and a positive value to the right.
p_unit (varchar2) - If NULL, the calculations are done using the underlying projection default units.
If an Oracle Unit of Measure is supplied (eg unit=M) that is value for the SRID,
- this value is used when calculating the p_offset distance.
RESULT
point (T_Vertex) - New point on bisection point or along bisector line with optional perpendicular offset.
EXAMPLE
-- Planar
With data as (
select SDO_GEOMETRY(3302,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(561981.279,1013120.171,0.00, 562044.981,1013076.691,77.1)) as sGeom,
SDO_GEOMETRY(3302,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(562044.981,1013076.691,77.1, 562024.253,1013138.371,142.2)) as nGeom
from dual
)
select 3 as dims,
CAST('Start Segment'
as
varchar2(30)) as description,
a.sGeom as offsetBetween
from data a
Union All
select 3 as dims,
CAST('Next Segment'
as
varchar2(30)) as description,
a.nGeom as offsetBetween
from data a
Union All
select a.sGeom.get_dims() as dims,
CAST('Offset Point @' || t.IntValue
as
varchar2(30)) as description,
T_Segment(a.sGeom)
.ST_OffsetBetween(
p_segment => T_Segment(a.nGeom),
p_offset => t.IntValue,
p_unit => 'unit=M')
.ST_Round(3)
.ST_SdoGeometry() as OffsetBetween
from data a,
table(tools.generate_series(-5,5,5)) t;
DIMS DESCRIPTION OFFSETBETWEEN
---- ----------------- ----------------------------------------------------------------------------------------------------------------------------------------
3 Start Segment SDO_GEOMETRY(3302,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(561981.279,1013120.171,0,562044.981,1013076.691,77.1))
3 Next Segment SDO_GEOMETRY(3302,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(562044.981,1013076.691,77.1,562024.253,1013138.371,142.2))
3 Offset Point @-5 SDO_GEOMETRY(3301,90000006,SDO_POINT_TYPE(562041.963,1013080.677,77.1),NULL,NULL)
3 Offset Point @0 SDO_GEOMETRY(3301,90000006,SDO_POINT_TYPE(562044.981,1013076.691,77.1),NULL,NULL)
3 Offset Point @5 SDO_GEOMETRY(3301,90000006,SDO_POINT_TYPE(562047.999,1013072.705,77.1),NULL,NULL)
-- Geodetic
With data as (
select SDO_GEOMETRY(3302,4326,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.7868589596,-45.0326616056,0.0, 147.7876729555,-45.0330473956,77.1)) as sGeom,
SDO_GEOMETRY(3302,4326,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.7876729555,-45.0330473956,77.1, 147.787402221,-45.032494027,142.2)) as nGeom
from dual
)
select 3 as dims,
CAST('Start Segment'
as
varchar2(20)) as description,
a.sGeom as offsetBetween
from data a
Union All
select 3 as dims,
CAST('Next Segment'
as
varchar2(20)) as description,
a.nGeom as offsetBetween
from data a
Union All
select a.sGeom.get_dims() as dims,
CAST('Offset Point @' || t.IntValue
as
varchar2(20)) as description,
T_Segment(a.sGeom)
.ST_OffsetBetween(
p_segment => T_Segment(a.nGeom),
p_offset => t.IntValue,
p_unit => 'unit=M') -- if 3D geodetic, compute as planar otherwise Oracle error
.ST_Round(8)
.ST_SdoGeometry() as OffsetBetween
from data a,
table(tools.generate_series(-5,5,5)) t;
DIMS DESCRIPTION OFFSETBETWEEN
---- ---------------- ------------------------------------------------------------------------------------------------------------------------------------------------
3 Start Segment SDO_GEOMETRY(3302,4326,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.7868589596,-45.0326616056,0,147.7876729555,-45.0330473956,77.1))
3 Next Segment SDO_GEOMETRY(3302,4326,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.7876729555,-45.0330473956,77.1,147.787402221,-45.032494027,142.2))
3 Offset Point @-5 SDO_GEOMETRY(2001,4326,SDO_POINT_TYPE(147.78763353,-45.03301215,NULL),NULL,NULL)
3 Offset Point @0 SDO_GEOMETRY(3301,4326,SDO_POINT_TYPE(147.78767296,-45.0330474,77.1),NULL,NULL)
3 Offset Point @5 SDO_GEOMETRY(2001,4326,SDO_POINT_TYPE(147.78771238,-45.03308265,NULL),NULL,NULL)
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_OffsetPoint [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_OffsetPoint -- Creates a point described by a ratio along the
segment and with a perpendicular offset.
SYNOPSIS
Member Function ST_OffsetPoint(p_ratio in Number,
p_offset in Number,
p_unit In Integer Default NULL)
Return &&INSTALL_SCHEMA..T_Vertex Deterministic
DESCRIPTION
Supplied with a ratio value (0.0 -> 1.0), this function uses that value to find the
point along its segment where it lies. If an offset value of 0.0 is supplied, the
discovered point is returned. If the p_offset value is <> 0, the function computes a new
position for the point at a distance of p_offset on the left (-ve) or right (+ve) side
of the segment.
The returned vertex's ordinate values are rounded using the supplied tolerance.
ARGUMENTS
p_ratio (number) - A value between 0 and 1, from the start vertex of the segment,
which describes the position of the point to be offset.
p_offset (number) - The perpendicular distance to offset the point generated using p_ratio.
A negative value instructs the function to offet the point to the left (start-end),
and a positive value to the right.
p_unit (VARCHAR2) - If NULL, the calculations are done using the underlying projection default units.
If an Oracle Unit of Measure is supplied (eg unit=M) that is value for the SRID,
this value is used when calculating the p_offset distance.
RESULT
vertex (T_VERTEX) - New point on line with optional perpendicular offset.
EXAMPLE
With data as (
select sdo_geometry(3302,4326,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.50,-43.132,100.0,147.41,-43.387,30000.0)) as geom
from dual
UNION ALL
select sdo_geometry(2002,4326,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.50,-43.132,147.41,-43.387)) as geom
from dual
)
select a.geom.get_dims() as dims,
t.IntValue as offset,
T_Segment(a.geom)
.ST_OffsetPoint(p_ratio => 0.25,
p_offset => t.IntValue,
p_unit => 'unit=M')
.ST_Round(8)
.ST_SdoGeometry() as offsetPoint
from data a,
table(tools.generate_series(-5,5,5)) t;
DIMS OFFSET OFFSETPOINT
---- ------ --------------------------------------------------------------------------------
3 -5 SDO_GEOMETRY(3301,4326,SDO_POINT_TYPE(152.19245167,-44.85985059,7575),NULL,NULL)
3 0 SDO_GEOMETRY(3301,4326,SDO_POINT_TYPE(147.4775,-43.19575,7575),NULL,NULL)
3 5 SDO_GEOMETRY(3301,4326,SDO_POINT_TYPE(142.76254833,-41.53164941,7575),NULL,NULL)
2 -5 SDO_GEOMETRY(2001,4326,SDO_POINT_TYPE(152.19245167,-44.85985059,NULL),NULL,NULL)
2 0 SDO_GEOMETRY(2001,4326,SDO_POINT_TYPE(147.4775,-43.19575,NULL),NULL,NULL)
2 5 SDO_GEOMETRY(2001,4326,SDO_POINT_TYPE(142.76254833,-41.53164941,NULL),NULL,NULL)
6 rows selected
With data as (
select SDO_GEOMETRY(3302,90000006,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),
SDO_ORDINATE_ARRAY(562046.642,1013077.602,0, 562032.193,1013252.074,0.035)) as geom
from dual
)
select t.IntValue as offset,
T_Segment(a.geom)
.ST_OffsetPoint(p_ratio => 0.25,
p_offset => t.IntValue,
p_unit => 'unit=M')
.ST_Round(3)
.ST_SdoGeometry() as offsetPoint
from data a,
table(tools.generate_series(-5,5,5)) t;
OFFSET OFFSETPOINT
---------- ----------------------------------------------------------------------------------
-5 SDO_GEOMETRY(3301,90000006,SDO_POINT_TYPE(562038.047,1013120.807,0.009),NULL,NULL)
0 SDO_GEOMETRY(3301,90000006,SDO_POINT_TYPE(562043.03,1013121.22,0.009),NULL,NULL)
5 SDO_GEOMETRY(3301,90000006,SDO_POINT_TYPE(562048.013,1013121.633,0.009),NULL,NULL)
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Parallel [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Parallel -- Moves segment parallel the provided p_offset distance.
SYNOPSIS
Member Function ST_Parallel(p_offset in Number)
Return &&INSTALL_SCHEMA..T_SEGMENT Deterministic,
DESCRIPTION
Computes parallel offset, left or right of underlying geometry.
Circular arcs are not yet correctly handled.
ARGUMENTS
p_offset (Number) -- Value +/- numeric value.
RESULT
New segment (T_SEGMENT) -- Input segment moved parallel by p_offset units
TODO
Check Circular Arc Calculations
EXAMPLE
with data as (
select 'Planar LineString' as test,
sdo_geometry(3302,NULL,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(1,1,1.1,6,6,5.95)) as geom,
5.0 as offset
from dual
union all
select 'Planar CircularString' as test,
SDO_GEOMETRY(2002,28355,NULL,
SDO_ELEM_INFO_ARRAY(1,2,2), -- Circular Arc line string
SDO_ORDINATE_ARRAY(252230.478,5526918.373, 252400.08,5526918.373,252230.478,5527000.0)) as geom,
-5.0 as offset
from dual
)
select a.test,
T_Segment(a.geom)
.ST_Parallel(p_offset=>a.offset)
.ST_Round(3,3,2,1)
.ST_SdoGeometry() as pGeom
from data a;
TEST PGEOM
--------------------- -------------------------------------------------------------------------------------------------------------------------------------------------
Planar LineString SDO_GEOMETRY(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(4.536,-2.536,1.1,9.536,2.464,5.95))
Planar CircularString SDO_GEOMETRY(2002,28355,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(252321.904,5527048.051,252318.419,5527048.243,252323.295,5527047.937))
AUTHOR
Simon Greener
HISTORY
Simon Greener - December 2008 - Original coding in GEOM package.
Simon Greener - January 2013 - Port/Rewrite to T_GEOMETRY object function member.
Simon Greener - January 2014 - Port/Rewrite to T_SEGMENT object function member.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_PointAlong [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_PointAlong -- Computes the vertex that lies a given fraction along the line defined by this segment.
SYNOPSIS
Member Function ST_pointAlong(segmentLengthFraction in Number)
Return &&INSTALL_SCHEMA..T_Vertex deterministic
DESCRIPTION
A fraction of <code>0.0</code> returns the start point of the segment;
a fraction of <code>1.0</code> returns the end point of the segment.
If the fraction is null; 0.0 or null; 1.0 the point returned
will lie before the start or beyond the end of the segment.
INPUTS
p_segmentLengthFraction (number) -- The fraction of the segment length along the line
RESULT
Returns the vertex at that distance along the segment
EXAMPLE
select &&INSTALL_SCHEMA..T_Segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,0,1,1)))
.ST_PointAlong(p_segmentLengthFraction=>0.5)
.ST_SdoGeometry() as mPoint
from dual;
MPOINT
--------------------------------------------------------------------
SDO_GEOMETRY(2001, NULL, SDO_POINT_TYPE(0.5, 0.5, NULL), NULL, NULL)
select &&INSTALL_SCHEMA..T_Segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,0,1,1)))
.ST_PointAlong(p_segmentLengthFraction=>0.9)
.ST_SdoGeometry() as mPoint
from dual;
MPOINT
--------------------------------------------------------------------
SDO_GEOMETRY(2001, NULL, SDO_POINT_TYPE(0.9, 0.9, NULL), NULL, NULL)
select &&INSTALL_SCHEMA..T_Segment(mdsys.sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,2),sdo_ordinate_array(0,0,10,10,20,0)))
.ST_PointAlong(p_segmentLengthFraction=>0.5)
.ST_SdoGeometry() as mPoint
from dual;
MPOINT
------------------------------------------------------------------
SDO_GEOMETRY(2001, NULL, SDO_POINT_TYPE(10, 10, NULL), NULL, NULL)
NOTES
From JTS LineSegment.java
2D only; no circular arcs.
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_PointAlongOffset [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_PointAlongOffset -- Computes the vertex that lies a given fraction along the line defined by this segment and offset from the segment by a given distance.
SYNOPSIS
Member Function ST_pointAlongOffset(
p_segmentLengthFraction in Number,
p_offsetDistance in Number
)
Return &&INSTALL_SCHEMA..T_Vertex deterministic
DESCRIPTION
A fraction of 0.0 offsets from the start point of the segment;
a fraction of 1.0 offsets from the end point of the segment.
The computed point is offset to the left of the line if the offset distance is
positive, to the right if negative.
INPUTS
p_segmentLengthFraction (number) -- The fraction of the segment length along the line
p_offsetDistance (number) -- The distance the point is offset from the segment (positive is to the left, negative is to the right)
RESULT
Returns the vertex at that distance and offset along the segment
NOTES
From JTS LineSegment.java
2D only; no circular arcs.
Throws Exception if the segment has zero length
AUTHOR
Simon Greener
HISTORY
Simon Greener - January 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_ProjectPoint [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_ProjectPoint -- Return a measured point by snapping provided point to the underlying LineString or circularString
SYNOPSIS
ST_ProjectPoint(p_vertex in &&INSTALL_SCHEMA..T_Vertex,
p_unit in varchar2)
Return &&INSTALL_SCHEMA..T_Vertex deterministic
DESCRIPTION
This function snaps supplied point to underlying LineString or CircularString, returning the snapped point.
Computes Z and M values if exist on underlying LineString or CircularString.
If input circularString is 2D, length from start of LineString or CircularString to point is returned in M ordinate of snapped point.
NOTES
Supports geodetic/geographic data.
INPUTS
p_vertex (t_vertex) - Point near to linestring or CircularString.
RESULT
snapped point (t_vetex) -- First point found on LineString.
EXAMPLE
select 'Point is on centre of the XYZ circular arc (returns start point)' as test,
t_segment(SDO_GEOMETRY(3002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.3246,-1, 0,7,-1, -3,6.3246,-1)))
.ST_ProjectPoint (
t_vertex(SDO_GEOMETRY('POINT(0 0)',NULL)),
null
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point does not have relationship with XYM LineString' as test,
t_segment(SDO_GEOMETRY(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,0, 0,7,3.08, -3,6.325,6.15)))
.ST_ProjectPoint (
t_vertex(SDO_GEOMETRY('POINT(8 8)',NULL))
).ST_AsEWKT() as project_point
from dual union all
select 'Point projects on to point half way along XY circular arc (returns measure as length)' as test,
t_segment(SDO_GEOMETRY('CIRCULARSTRING (3 6.3246, 0 7, -3 6.3246)',NULL))
.ST_ProjectPoint (
t_vertex(SDO_GEOMETRY('POINT(0 3.5)',NULL)),
null
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point has relationship with XYM LineString' as test,
t_segment(SDO_GEOMETRY(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,0, 0,7,3.08, -3,6.325,6.15)))
.ST_ProjectPoint (
t_vertex(SDO_GEOMETRY('POINT(2 8)',NULL))
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point has relationship with XYZM circular arc' as test,
t_segment(SDO_GEOMETRY(4402,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,-2.1,0, 0,7,-2.1,3.08, -3,6.325,-2.1,6.15)))
.ST_ProjectPoint (
t_vertex(SDO_GEOMETRY('POINT(2 8)',NULL)),
null
).ST_Round(3).ST_AsEWKT() as project_point
from dual union all
select 'Geodetic Point has relationship with XYZM Geodetic LineString' as test,
T_Segment(MDSYS.SDO_GEOMETRY(3302,4326,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(147.5,-43.132,100,147.41,-43.387,30000)))
.ST_ProjectPoint (
t_vertex(SDO_GEOMETRY(2001,8307,SDO_POINT_TYPE(147.509,-43.221,NULL),NULL,NULL))
).ST_Round(3).ST_AsEWKT() as project_point
from dual ;
TEST PROJECT_POINT
------------------------------------------------------------------------------------- ---------------------------------
Point is on centre of the XYZ circular arc (returns start point) POINTZ (3 6.325 -1)
Point does not have relationship with XYM CircularSring NULL
Point projects on to point half way along XY circular arc (returns measure as length) POINTM (0 7 3.1)
Point has relationship with XYM CircularSring POINTM (1.698 6.791 1.374)
Point has relationship with XYZM circular arc POINTZM (1.698 6.791 -2.1 1.374)
Geodetic Point has relationship with XYZM Geodetic LineString SRID=8307;POINTM (147.44551945 -43.23290209 11930.116)
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2019 - Original coding.
COPYRIGHT
(c) 2008-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Reverse [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Reverse -- Reverses underlying segment's start and end coordinates.
SYNOPSIS
Member Function ST_Reverse
Return &&INSTALL_SCHEMA..T_SEGMENT Deterministic,
DESCRIPTION
Constructs new segment by swapping start and end coordinates of underlying segment.
If underlying segment has a middle coordinate it is left in place.
RESULT
segment (T_SEGMENT) -- segment that has reverse direction to the original segment.
EXAMPLE
select T_Segment(
sdo_geometry(2002,NULL,NULL,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0,0,10,10))
).ST_Reverse()
.ST_SdoGeometry() as rSegment
from dual;
RSEGMENT
-------------------------------------------------------------------------------------
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(10,10,0,0))
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Round [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Round -- Rounds X,Y,Z and m(w) ordinates of segment's coordinates usoing object's PrecisionModel.
SYNOPSIS
Member Function ST_Round
Return &&INSTALL_SCHEMA..T_SEGMENT Deterministic,
DESCRIPTION
Applies internal object's precisionModel decimal digits of precision value to ordinates of object.
If internal PrecisionModel is null, the object is returned unchanged.
If an internal PrecisionModel element is null the default values for the called ST_Round are applied.
RESULT
segment (T_SEGMENT) -- T_Segment with rounded ordinates using SELF.PrecisionModel values.
NOTES
Is wrapper over ST_Round( y, y, z, m );
EXAMPLE
with data as (
select sdo_geometry(4402,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349,1.3456,0.0005, 10.87365,11.983645,1.98434,14.38573)) as geom
From Dual
Union all
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349,1.3456,10.87365,11.983645,1.98434)) as geom
From Dual
Union all
select sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349, 10.87365,11.983645 )) as geom
from dual
)
select T_Segment(a.geom)
.ST_Round().ST_SdoGeometry() as rGeom
from data a;
RGEOM
-------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(4402,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0.002,0.183,1.3,0,10.874,11.984,2,14.39))
SDO_GEOMETRY(3002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0.002,0.183,1.3,10.874,11.984,2))
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0.002,0.183,10.874,11.984))
AUTHOR
Simon Greener
HISTORY
Simon Greener - July 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Round(x y z m) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Round -- Rounds X,Y,Z and m(w) ordinates of segment's coordinates to passed in precision.
SYNOPSIS
Member Function ST_Round(p_dec_places_x in integer, p_dec_places_y in integer default NULL, p_dec_places_z in integer default 3, p_dec_places_m in integer default 3) Return &&INSTALL_SCHEMA..T_SEGMENT Deterministic,
DESCRIPTION
Applies relevant decimal digits of precision value to ordinate.
For example:
SELF.x := ROUND(SELF.x,p_dec_places_x);
ARGUMENTS
p_dec_places_x (integer) - value applied to x Ordinate.
p_dec_places_y (integer) - value applied to y Ordinate.
p_dec_places_z (integer) - value applied to z Ordinate.
p_dec_places_m (integer) - value applied to m Ordinate.
RESULT
segment (T_SEGMENT)
EXAMPLE
with data as (
select sdo_geometry(4402,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349,1.3456,0.0005, 10.87365,11.983645,1.98434,14.38573)) as geom
From Dual
Union all
select sdo_geometry(3002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349,1.3456,10.87365,11.983645,1.98434)) as geom
From Dual
Union all
select sdo_geometry(2002,null,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(0.0023763,0.18349, 10.87365,11.983645 )) as geom
from dual
)
select T_Segment(a.geom)
.ST_Round(p_dec_places_x=>3,
p_dec_places_y=>3,
p_dec_places_z=>1,
p_dec_places_m=>2
).ST_SdoGeometry() as rGeom
from data a;
RGEOM
-------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(4402,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0.002,0.183,1.3,0,10.874,11.984,2,14.39))
SDO_GEOMETRY(3002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0.002,0.183,1.3,10.874,11.984,2))
SDO_GEOMETRY(2002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0.002,0.183,10.874,11.984))
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_SdoGeometry [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_SdoGeometry -- Returns segment as a suitably encoded MDSYS.SDO_GEOMETRY object.
SYNOPSIS
Member Function ST_SdoGeometry(p_dims in integer default null)
Return MDSYS.sdo_geometry Deterministic,
DESCRIPTION
Geometry depends on how the segment is described (vertex-connected or circular arc).
Also, p_dims can force 3D linestring to be returned as a 2D linestring.
ARGUMENTS
p_dims in integer default null - A dimension value that will override SELF.ST_Dims() eg to return 2D from a 3D segment.
RESULT
linestring (MDSYS.SDO_GEOMETRY) -- Two (or three) point linestring.
EXAMPLE
select T_Segment(
p_segment_id => 0,
p_startCoord => t_Vertex(
p_id=>1,
p_x=>0.0023763,
p_y=>0.18349,
p_z=>1.346,
p_w=>0.001,
p_sdo_gtype=>4401,
p_sdo_srid=>NULL
),
p_EndCoord => T_Vertex(
p_id=>2,
p_x=>10.87365,
p_y=>11.983645,
p_z=>1.984,
p_w=>14.386,
p_sdo_gtype=>4401,
p_sdo_srid=>NULL
),
p_sdo_gtype=>4402,
p_sdo_srid=>NULL
).ST_SdoGeometry() as geom
from dual;
GEOM
-----------------------------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(4402,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(0.0023763,0.18349,1.346,0.001,10.87365,11.983645,1.984,14.386))
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_Self [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_Self -- Handy method for use with TABLE(T_Segments) to return element as T_Segment object.
SYNOPSIS
Member Function ST_Self
Return T_Segment Deterministic,
DESCRIPTION
When segmentizing linear geometries into T_Segment objects via a TABLE function call to T_GEOMETRY.T_SEGMENTIZE() it is handy to have a method which allows access to the result as a single object. In a sense this method allows access similar to t.COLUMN_VALUE for atmoic datatype access from TABLE functions.
RESULT
segment (T_SEGMENT) -- A single T_Segment object.
EXAMPLE
set serveroutput on
BEGIN
FOR rec IN (select seg.segment_id, seg.ST_Self() as line
from table(t_geometry(
SDO_GEOMETRY(2002,28355,NULL,
SDO_ELEM_INFO_ARRAY(1,2,1),
SDO_ORDINATE_ARRAY(252282.861,5526962.496,252282.861,5526882.82, 252315.91,5526905.639, 252287.189,5526942.228)) )
.ST_Segmentize('ALL')) seg
)
LOOP
dbms_output.put_line(rec.line.ST_AsText());
END LOOP;
END;
/
anonymous block completed
SEGMENT(1,1,1,Start(1,252282.861,5526962.496,NULL,NULL,2001,28355),End(2,252282.861,5526882.82,NULL,NULL,2001,28355),SDO_GTYPE=2002,SDO_SRID=28355)
SEGMENT(1,1,2,Start(2,252282.861,5526882.82,NULL,NULL,2001,28355),End(3,252315.91,5526905.639,NULL,NULL,2001,28355),SDO_GTYPE=2002,SDO_SRID=28355)
SEGMENT(1,1,3,Start(3,252315.91,5526905.639,NULL,NULL,2001,28355),End(4,252287.189,5526942.228,NULL,NULL,2001,28355),SDO_GTYPE=2002,SDO_SRID=28355)
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_SetCoordinates(vertex vertex vertex) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_SetCoordinates -- Allows user to set a segment's start/mid/end coordinates
SYNOPSIS
Member Procedure ST_SetCoordinates(SELF IN OUT NOCOPY T_SEGMENT, p_startCoord in &&INSTALL_SCHEMA..T_VERTEX, p_midCoord in &&INSTALL_SCHEMA..T_VERTEX, p_endCoord in &&INSTALL_SCHEMA..T_VERTEX),
DESCRIPTION
This procedure allows a user to set a segment's coordinates without creating a new segment.
If a NULL value is provided for the midCoord parameter its associated coordinate will be set to NULL.
If a NULL value is provided for the startCoord or endCoord it is ignored as it would otherwise invalidate the object.
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_SetCoordinates(vertex vertex) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_SetCoordinates -- Allows user to set object's start or end coordinates.
SYNOPSIS
Member Procedure ST_SetCoordinates(SELF IN OUT NOCOPY T_SEGMENT, p_startCoord in &&INSTALL_SCHEMA..T_VERTEX, p_endCoord in &&INSTALL_SCHEMA..T_VERTEX),
DESCRIPTION
This procedure allows a user to set a segment's coordinates without creating a new segment.
If a NULL value is provided for a parameter it is ignored as it would otherwise invalidate the object.
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_SetPrecisionModel [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_SetPrecisionModel -- Allows user to set object's t_precision object.
SYNOPSIS
Member Procedure ST_SetPrecisionModel(SELF IN OUT NOCOPY T_SEGMENT, p_precision &&INSTALL_SCHEMA..T_PrecisionModel),
DESCRIPTION
This procedure allows a user to set the object's precision values in its t_precision object.
If a NULL value is provided for a precision object element, the existing value is maintained.
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2019 - Original coding.
COPYRIGHT
(c) 2005-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_SRID [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_SRID -- Returns the object's SDO_SRID attribute value.
SYNOPSIS
Member Function ST_SRID
Return INTEGER Deterministic,
DESCRIPTION
Returns sdo_srid object attribute.
RESULT
spatial reference id (INTEGER) -- eg 8311 etc.
EXAMPLE
with data as (
select T_Segment(
SDO_GEOMETRY('CIRCULARSTRING(252230.478 5526918.373, 252400.08 5526918.373, 252230.478 5527000.0)',28355)
) as circular_segment
from dual
)
select a.circular_segment.ST_Srid() as Srid
from data a;
SRID
-----
28355
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_To2D [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_To2D -- Constructs a 2D segment from the underlying segment which can have any dimension.
SYNOPSIS
Member Function ST_To2D
Return &&INSTALL_SCHEMA..T_SEGMENT Deterministic,
DESCRIPTION
Constructs new segment by discarding any z and w ordinates.
SDO_GTYPE returned will be 2001.
If segment already 2D it is returned unchanged.
RESULT
segment (T_SEGMENT) -- 2d segment.
EXAMPLE
select T_Segment(sdo_geometry(3002,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5, -42.5,10.0, 147.6, -42.5, 10.0)))
.ST_To2D()
.ST_SdoGeometry(2) as geom2D
from dual;
GEOM2D
---------------------------------------------------------------------------------------------------
SDO_GEOMETRY(2002,4283,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.5,-42.5,147.6,-42.5))
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_To3D [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_To3D -- Constructs a 3D segment from the underlying segment which can have any dimension.
SYNOPSIS
Member Function ST_To3D(p_keep_measure in integer default 0,
p_default_z in number default null)
Return &&INSTALL_SCHEMA..T_SEGMENT Deterministic,
DESCRIPTION
Constructs new 3D segment.
If segment 2D is has any p_default_z values added to the new segment's z ordinates.
If segment is 3D with no measure it is returned without change.
If segment is 3D with Measure it is returned as an unmeasured 3D segment with the Z ordinates
being the original measure values if p_keep_measure = 1, otherwise, the Z values are set to p_default_z.
If segment is 4D with Measure it is returned as an unmeasured 3D segment with the Z ordinates
being the original measure values if p_keep_measure = 1, otherwise, the Z values are set to p_default_z.
RESULT
segment (T_SEGMENT) -- 3D segment.
EXAMPLE
-- Convert 2D segment to 3D with constant Z value of 10.0
select T_Segment(sdo_geometry(2002,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5, -42.5, 147.6,-42.5)))
.ST_To3D(p_keep_measure => 0,
p_default_z => 10.0)
.ST_SdoGeometry(3) as geom3D
from dual;
GEOM3D
---------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(3002,4283,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(147.5,-42.5,10,147.6,-42.5,10))
-- Convert measured segment (no Z) to 3D with Z
select T_Segment(sdo_geometry(3302,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5, -42.5,0.0, 147.6, -42.5, 10923.0)))
.ST_To3D(p_keep_measure => 1)
.ST_SdoGeometry(3) as geom3D
from dual;
GEOM3D
-----------------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(3002,4283,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(147.5,-42.5,0,147.6,-42.5,10923))
-- Convert measured segment with Z to 3D with Z (throw M away)
select T_Segment(sdo_geometry(4402,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5,-42.5,849.9,2000.0, 147.6,-42.5,1923.0,4000.0)))
.ST_To3D(p_keep_measure => 0)
.ST_SdoGeometry(3) as geom3D
from dual;
GEOM3D
--------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(3002,4283,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.5,-42.5,849.9,147.6,-42.5,1923))
-- Convert measured segment with Z to 3D with M becoming Z (throw Z away)
select T_Segment(sdo_geometry(4402,4283,null,sdo_elem_info_array(1,2,1),sdo_ordinate_array(147.5,-42.5,849.9,2000.0, 147.6,-42.5,1923.0,4000.0)))
.ST_To3D(p_keep_measure => 1)
.ST_SdoGeometry(3) as geom3D
from dual;
GEOM3D
-------------------------------------------------------------------------------------------------------------
SDO_GEOMETRY(3002,4283,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(147.5,-42.5,2000,147.6,-42.5,4000))
AUTHOR
Simon Greener
HISTORY
Simon Greener - Jan 2013 - Original coding.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/ST_UpdateCoordinate(p_vertex) [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_UpdateCoordinate -- Function which updates the start, mid or end coordinate depending on p_which.
SYNOPSIS
Member Function ST_UpdateCoordinate(p_coordinate in &&INSTALL_SCHEMA..T_Vertex,
p_which in varchar2 default 'S' )
Return &&INSTALL_SCHEMA..T_SEGMENT Deterministic,
DESCRIPTION
Function that updates start, mid or end coordinate the underlying T_Segment which value in p_coordinate depending on position identified by p_which.
p_which can have one of 6 values. See Arguments.
ARGUMENTS
p_coordinate (T_Vertex) -- Replacement coordinate which must not be null otherwise T_Segment is unchanged.
p_which (varchar2) -- Can be one of the following values:
- NULL : defaults to 'S'
- 'S' or '1' : StartCoord
- 'M' or '2' : midCoord
- 'E' or '3' : endCoord
RESULT
updated segment (T_Segment) - Geometry with coordinate replaced.
EXAMPLE
select T_Segment(
p_Segment_id => 0,
p_startCoord => T_Vertex(
p_id => 1,
p_x => 10,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_endCoord => T_Vertex(
p_id => 3,
p_x => 20,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_sdo_gtype => 2002,
p_sdo_srid => NULL
)
.ST_UpdateCoordinate(
p_coordinate => T_Vertex(
p_x => 99.0,
p_y => 100.0,
p_id => 1,
p_sdo_gtype => 2001,
p_sdo_srid => NULL),
p_which => 1
)
.startCoord
.ST_AsText() as updatedSegment
from dual;
UPDATEDSEGMENT
--------------------------------------
T_Vertex(99,100,NULL,NULL,1,2001,NULL)
-- Create midCoord where doesn't exist.
select T_Segment(
p_Segment_id => 0,
p_startCoord => T_Vertex(
p_id => 1,
p_x => 10,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_endCoord => T_Vertex(
p_id => 3,
p_x => 20,
p_y => 0,
p_sdo_gtype => 2001,
p_sdo_srid => NULL
),
p_sdo_gtype => 2002,
p_sdo_srid => NULL
)
.ST_UpdateCoordinate(
p_coordinate => T_Vertex(
p_x => 99.0,
p_y => 100.0,
p_id => 2,
p_sdo_gtype => 2001,
p_sdo_srid => NULL),
p_which => '2'
)
.ST_AsText() as updatedSegment
from dual;
UPDATEDSEGMENT
------------------------------------------
SEGMENT(NULL,NULL,0,
Start(10,0,NULL,NULL,1,2001,NULL),
Mid(99,100,NULL,NULL,2,2001,NULL),
End(20,0,NULL,NULL,3,2001,NULL),
SDO_GTYPE=2002,SDO_SRID=NULL)
AUTHOR
Simon Greener
HISTORY
Simon Greener - December 2006 - Original Coding for GEOM package.
Simon Greener - July 2011 - Port to T_GEOMETRY.
COPYRIGHT
(c) 2005-2018 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/STPointToCircularArc [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_PointToCircularArc -- Return a measured point by snapping provided point to the provided circularstring
SYNOPSIS
ST_PointToCircularArc(p_vertex in &&INSTALL_SCHEMA..T_Vertex,
p_unit in varchar2 default null)
Return &&INSTALL_SCHEMA..T_Vertex deterministic
DESCRIPTION
This function snaps supplied point to underlying circularString, returning the snapped point.
Computes Z and M values if exist on underlying CircularString.
If input circularString is 2D, length from start of circularString to point is returned in M ordinate of snapped point.
NOTES
Supports CircularString geometries only.
INPUTS
p_vertex (t_vertex) - Point near to linestring.
p_unit (varchar2) - Unit of measure (depends on SRID)
RESULT
snapped point (t_vetex) -- First point found on circularString.
EXAMPLE
select 'Point is on centre of the XYZ circular arc (returns start point)' as test,
t_segment(SDO_GEOMETRY(3002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.3246,-1, 0,7,-1, -3,6.3246,-1)))
.ST_PointToCircularArc (
t_vertex(SDO_GEOMETRY('POINT(0 0)',NULL)),
null
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point does not have relationship with XYM CircularSring' as test,
t_segment(SDO_GEOMETRY(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,0, 0,7,3.08, -3,6.325,6.15)))
.ST_PointToCircularArc (
t_vertex(SDO_GEOMETRY('POINT(8 8)',NULL))
).ST_AsEWKT() as project_point
from dual union all
select 'Point projects on to point half way along XY circular arc (returns measure as length)' as test,
t_segment(SDO_GEOMETRY('CIRCULARSTRING (3 6.3246, 0 7, -3 6.3246)',NULL))
.ST_PointToCircularArc (
t_vertex(SDO_GEOMETRY('POINT(0 3.5)',NULL)),
null
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point has relationship with XYM CircularSring' as test,
t_segment(SDO_GEOMETRY(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,0, 0,7,3.08, -3,6.325,6.15)))
.ST_PointToCircularArc (
t_vertex(SDO_GEOMETRY('POINT(2 8)',NULL))
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point has relationship with XYZM circular arc' as test,
t_segment(SDO_GEOMETRY(4402,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,-2.1,0, 0,7,-2.1,3.08, -3,6.325,-2.1,6.15)))
.ST_PointToCircularArc (
t_vertex(SDO_GEOMETRY('POINT(2 8)',NULL)),
null
).ST_Round(3).ST_AsEWKT() as project_point
from dual ;
TEST PROJECT_POINT
------------------------------------------------------------------------------------- -----------------------------
Point is on centre of the XYZ circular arc (returns start point) POINTZ (3 6.325 -1)
Point does not have relationship with XYM CircularSring NULL
Point projects on to point half way along XY circular arc (returns measure as length) POINTM (0 7 3.1)
Point has relationship with XYM CircularSring POINTM (1.698 6.791 1.374)
Point has relationship with XYZM circular arc POINTZM (1.698 6.791 -2.1 1.374)
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2019 - Original coding.
COPYRIGHT
(c) 2008-2019 by TheSpatialDBAdvisor/Simon Greener
T_SEGMENT/STPointToLineString [ Methods ]
[ Top ] [ T_SEGMENT ] [ Methods ]
NAME
ST_PointToLineString -- Return a measured point by snapping provided point to the underlying LineString
SYNOPSIS
ST_PointToLineString(p_vertex in &&INSTALL_SCHEMA..T_Vertex)
Return &&INSTALL_SCHEMA..T_Vertex deterministic
DESCRIPTION
This function snaps supplied point to underlying LineString, returning the snapped point.
Computes Z and M values if exist on underlying LineString.
If input circularString is 2D, length from start of LineString to point is returned in M ordinate of snapped point.
NOTES
Supports LineString geometries only.
INPUTS
p_vertex (t_vertex) - Point near to linestring.
RESULT
snapped point (t_vetex) -- First point found on LineString.
EXAMPLE
select 'Point is on centre of the XYZ circular arc (returns start point)' as test,
t_segment(SDO_GEOMETRY(3002,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.3246,-1, 0,7,-1, -3,6.3246,-1)))
.ST_PointToLineString (
t_vertex(SDO_GEOMETRY('POINT(0 0)',NULL)),
null
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point does not have relationship with XYM LineString' as test,
t_segment(SDO_GEOMETRY(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,0, 0,7,3.08, -3,6.325,6.15)))
.ST_PointToLineString (
t_vertex(SDO_GEOMETRY('POINT(8 8)',NULL))
).ST_AsEWKT() as project_point
from dual union all
select 'Point projects on to point half way along XY circular arc (returns measure as length)' as test,
t_segment(SDO_GEOMETRY('CIRCULARSTRING (3 6.3246, 0 7, -3 6.3246)',NULL))
.ST_PointToLineString (
t_vertex(SDO_GEOMETRY('POINT(0 3.5)',NULL)),
null
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point has relationship with XYM LineString' as test,
t_segment(SDO_GEOMETRY(3302,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,0, 0,7,3.08, -3,6.325,6.15)))
.ST_PointToLineString (
t_vertex(SDO_GEOMETRY('POINT(2 8)',NULL))
).ST_Round(3,3,3,3).ST_AsEWKT() as project_point
from dual union all
select 'Point has relationship with XYZM circular arc' as test,
t_segment(SDO_GEOMETRY(4402,NULL,NULL,SDO_ELEM_INFO_ARRAY(1,2,2),SDO_ORDINATE_ARRAY(3,6.325,-2.1,0, 0,7,-2.1,3.08, -3,6.325,-2.1,6.15)))
.ST_PointToLineString (
t_vertex(SDO_GEOMETRY('POINT(2 8)',NULL)),
null
).ST_Round(3).ST_AsEWKT() as project_point
from dual ;
TEST PROJECT_POINT
------------------------------------------------------------------------------------- -----------------------------
Point is on centre of the XYZ circular arc (returns start point) POINTZ (3 6.325 -1)
Point does not have relationship with XYM CircularSring NULL
Point projects on to point half way along XY circular arc (returns measure as length) POINTM (0 7 3.1)
Point has relationship with XYM CircularSring POINTM (1.698 6.791 1.374)
Point has relationship with XYZM circular arc POINTZM (1.698 6.791 -2.1 1.374)
AUTHOR
Simon Greener
HISTORY
Simon Greener - August 2019 - Original coding.
COPYRIGHT
(c) 2008-2019 by TheSpatialDBAdvisor/Simon Greener