ST_HasM

Introduction: Checks for the presence of M coordinate values representing measures or linear references. Returns true if the input geometry includes an M coordinate, false otherwise.

Format: ST_HasM(geom: Geometry)

Return type: Boolean

Since: v1.6.1

SQL Example

SELECT ST_HasM(
        ST_GeomFromWKT('POLYGON ZM ((30 10 5 1, 40 40 10 2, 20 40 15 3, 10 20 20 4, 30 10 5 1))')
)

Output:

True