STLocateBetweenElevations

STLocateBetweenElevations — Computes and returns elements that intersect the specified Z range. Function Specification Description Is implementation of PostGIS: Processes the supplied (3D, 3DM) (multi)linestring returning the elements that intersect the specified range of elevations inclusively. May return points and/or linestrings in the appropriate geometry type. Where a new xy position is to be computed,Read More

STLineSubstring

STLineSubstring — Returns a substring of the providec linestring starting and ending at the given fractions (between 0 and 1) of total 2D length or measure range. Function Specification Description Given a start and end measure, this function extracts the line segment defined between them (a point if start=end). If a non-zero value is suppliedRead More

STIsPseudoMultiCurve

STIsPseudoMultiCurve — Checks if supplied @p_geometry is a GeometryCollection object containing only LineString, CircularString and CompoundCurve elements. Function Specification. Description. This function checks if the supplied @p_geometry is a GeometryCollection object containing only LineString, CircularString and CompoundCurve elements. One cannot create a MultiLineString object where an element is a CircularString or CompoundCurve. Any attempt toRead More

STFindPointByMeasure

STFindPointByMeasure — Returns (possibly offset) point geometry at supplied measure along linestring. Function Specification. Description. Given a measure, this function returns a geometry point at that measure. If a non-zero/null value is suppied for @p_offset, the found point is offset (perpendicular to line) to the left (if @p_offset < 0) or to the right (ifRead More

STLocateAlong

STLocateAlong — Returns (possibly offset) point geometry at supplied measure along linestring. Function Specification. Description. This function is identical to STFindPointByName and so is a synonym for it. Given a measure, this function returns a geometry point at that measure. If a non-zero/null value is suppied for @p_offset, the found point is offset (perpendicular toRead More