Name
ST_ZMFlag — ST_Geometry 값의 좌표 차원을 반환합니다.
Synopsis
smallint ST_ZMFlag(geometry geomA);
설명
ST_Geometry 값의 좌표 차원을 반환합니다.
Values are: 0 = 2D, 1 = 3D-M, 2 = 3D-Z, 3 = 4D.
This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves.
예시
SELECT ST_ZMFlag(ST_GeomFromEWKT('LINESTRING(1 2, 3 4)'));
0
SELECT ST_ZMFlag(ST_GeomFromEWKT('LINESTRINGM(1 2 3, 3 4 3)'));
1
SELECT ST_ZMFlag(ST_GeomFromEWKT('CIRCULARSTRING(1 2 3, 3 4 3, 5 6 3)'));
2
SELECT ST_ZMFlag(ST_GeomFromEWKT('POINT(1 2 3 4)'));
3