返回給定Geometry對(duì)象的維度數(shù)。
語(yǔ)法
integer ST_CoordDim(geometry geomA);
參數(shù)
參數(shù)名稱 | 描述 |
---|---|
geomA | 目標(biāo)Geometry對(duì)象。 |
描述
- 這是ST_NDims
- 該函數(shù)支持Circular Strings、Curves、Polyhedral surfaces、Triangles、Triangulated Irregular Network Surfaces(TIN)和3D對(duì)象。
示例
- 2維對(duì)象:
SELECT ST_CoordDim('POINT(1 0)'); st_coorddim ------------- 2 (1 row)
- 3維對(duì)象(3DM和3DZ):
SELECT ST_CoordDim('POINT(1 0 1)'); st_coorddim ------------- 3 (1 row) SELECT ST_CoordDim('POINTM(1 0 1)'); st_coorddim ------------- 3 (1 row)
- 4維對(duì)象:
SELECT ST_CoordDim('POINT(1 0 1 1)'); st_coorddim ------------- 4 (1 row)