ST_M — Return the M coordinate of the point, or NULL if not available. Input must be a point.
float ST_M(
geometry a_point)
;
Return the M coordinate of the point, or NULL if not available. Input must be a point.
This is not (yet) part of the OGC spec, but is listed here to complete the point coordinate extractor function list. |
This method implements the OpenGIS Simple Features Implementation Specification for SQL.
This method implements the SQL/MM specification: SQL-MM 3 New standard: ?
This function supports 3d and will not drop the z-index.