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How to apply spatial constraints to PostGIS tables
This article was written before TypeMod was introduced eg Geometry(Polygon,28355) As I have pointed out in other blog articles, spatial data quality should not engender
15 April, 2020
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Loading and Processing GPX 1.1 files using PostgreSQL XML
My good friend Regina Obe has taken my article Loading and Processing GPX 1.1 files using Oracle XMLDB and implemented it using PostgreSQL’s XML implementation.
15 April, 2020
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Converting Oracle Optimized Rectangles to PostGIS
Someone on the PostGIS discussion list asked about a problem converting an Oracle database to PostGIS and he had run into some difficulties with Oracle’s
15 April, 2020
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Building polygons from overlapping linestrings requiring intersection
I received an email a few weeks ago asking: I was wondering if you could post an article explaining how to create a polygon from
15 April, 2020
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Loading Point Data from a CSV File in PostGIS
I recently wrote an article on the use of External File with Oracle tables to load point data into Oracle. I thought I would have
15 April, 2020
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DMS2DD for PostGIS
Yesterday, I posted a short article on Converting Google Earth Formatted Longitude/Latitude points to decimal degrees. The Google Earth longitude/latitude values are expressed as a
15 April, 2020
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Implementing Oracle’s GetVertices function in PostGIS – ST_DumpPoints
The GetVertices function in the MDSYS.SDO_UTIL package in Oracle Spatial is an exceedingly useful function. From the Oracle documentation of this function: This function returns
13 April, 2020
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Filtering Rings in Polygon (PostGIS)
This is my first blog article on PostGIS. On the PostGIS discussion list, a question was asked: > I have a polygon table that has
2 April, 2020
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STAsEWKT
STAsEWKT — Implements an method to create Extended Well Known Text (EWKT) strings from the input @p_geometry. Introduction/Description The Open Geospatial Consortium’s, Simple Features Specifications
3 January, 2020
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STGeomFromEWKT
STGeomFromEWKT — Function that implements an import method for Extended Well Known Text including EWKT with SRID, Z and M ordinates.. Introduction/Description The Open Geospatial
1 January, 2020
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