This topic describes the ST_CoordDim function. This function returns the coordinate dimension of a geometry object.

Syntax

integer  ST_CoordDim(geometry  geomA);

Parameters

Parameter Description
geomA The geometry object that you want to specify.

Description

  • The ST_CoordDim function is the alias of the ST_NDims function.
  • This function supports circular strings, curves, polyhedral surfaces, triangles, triangulated irregular network (TIN) surfaces, and 3D objects.

Examples

  • Execute the following statement to return a 2D object:
    SELECT ST_CoordDim('POINT(1 0)');
 st_coorddim
-------------
           2
(1 row)
  • Execute the following statement to return a 3DM or 3DZ object:
    SELECT ST_CoordDim('POINT(1 0 1)');
 st_coorddim
-------------
           3
(1 row)

SELECT ST_CoordDim('POINTM(1 0 1)');
 st_coorddim
-------------
           3
(1 row)
  • Execute the following statement to return a 4D object:
    SELECT ST_CoordDim('POINT(1 0 1 1)');
 st_coorddim
-------------
           4
(1 row)