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ST_M

ST_M
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Name

ST_M — Returns the M coordinate of a Point.

Synopsis

float ST_M ( geometry a_point ) ;

Description

Return the M coordinate of a Point, or NULL if not available. Input must be a Point.

[Note]

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 OGC Simple Features Implementation Specification for SQL 1.1.

This method implements the SQL/MM specification.

This function supports 3d and will not drop the z-index.

Examples 

SELECT ST_M(ST_GeomFromEWKT('POINT(1 2 3 4)'));
 st_m
------
	4
(1 row)