ST_Force3DM — Zwingt die Geometrien in einen XYM Modus.
geometry ST_Force3DM(
geometry geomA, float Mvalue = 0.0)
;
Forces the geometries into XYM mode. If a geometry has no M component, then a Mvalue
M coordinate is tacked on. If it has a Z component, then Z is removed
Änderung: 2.1.0. Bis zu 2.0.x wurde diese Funktion mit ST_Force_3DM bezeichnet.
Changed: 3.1.0. Added support for supplying a non-zero M value.
This method supports Circular Strings and Curves.
--Nothing happens to an already 3D geometry SELECT ST_AsEWKT(ST_Force3DM(ST_GeomFromEWKT('CIRCULARSTRING(1 1 2, 2 3 2, 4 5 2, 6 7 2, 5 6 2)'))); st_asewkt ------------------------------------------------ CIRCULARSTRINGM(1 1 0,2 3 0,4 5 0,6 7 0,5 6 0) SELECT ST_AsEWKT(ST_Force3DM('POLYGON((0 0 1,0 5 1,5 0 1,0 0 1),(1 1 1,3 1 1,1 3 1,1 1 1))')); st_asewkt --------------------------------------------------------------- POLYGONM((0 0 0,0 5 0,5 0 0,0 0 0),(1 1 0,3 1 0,1 3 0,1 1 0))