説明

ポイントのZM (次元の意味)フラグをsmall intで返します。値は 0=XY, 1=XYM, 2=XYZ, 3=XYZMとなります。

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

This method supports Circular Strings and Curves

例

SELECT ST_Zmflag(ST_GeomFromEWKT('LINESTRING(1 2, 3 4)'));
 st_zmflag
-----------
                 0

SELECT ST_Zmflag(ST_GeomFromEWKT('LINESTRINGM(1 2 3, 3 4 3)'));
 st_zmflag
-----------
                 1

SELECT ST_Zmflag(ST_GeomFromEWKT('CIRCULARSTRING(1 2 3, 3 4 3, 5 6 3)'));
 st_zmflag
-----------
                 2
SELECT ST_Zmflag(ST_GeomFromEWKT('POINT(1 2 3 4)'));
 st_zmflag
-----------
                 3

関連情報

ST_CoordDim, ST_NDims, ST_Dimension