This topic describes the ST_M function. This function returns the m coordinate of the input geometry object. The input geometry object must be a point object.

Syntax

float  ST_M(geometry  aPoint);

Parameters

Parameter Description
aPoint The point object that you want to specify.

Description

This function supports 3D objects and does not delete z coordinates.

Examples

SELECT ST_M('POINTM(0 1 2)'::geometry);
 st_m
------
    2
(1 row)