PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual108 / 3107.4.18 ST_NDimsST_NDims — Returns coordinate dimension of the geometry as a small int. Values are: 2,3 or 4.Synopsisinteger ST_NDims(geometry g1);DescriptionReturns the coordinate dimension of the geometry. PostGIS supports 2 - (x,y) , 3 - (x,y,z) or 2D with measure - x,y,m, and 4 - 3Dwith measure space x,y,z,mThis function supports 3d and will not drop the z-index.ExamplesSELECT ST_NDims(ST_GeomFromText(’POINT(1 1)’)) As d2point,ST_NDims(ST_GeomFromEWKT(’POINT(1 1 2)’)) As d3point,ST_NDims(ST_GeomFromEWKT(’POINTM(1 1 0.5)’)) As d2pointm;d2point | d3point | d2pointm---------+---------+----------2 | 3 | 3See AlsoST_CoordDim, ST_Dimension, ST_GeomFromEWKT7.4.19 ST_NPointsST_NPoints — Return the number of points (vertexes) in a geometry.Synopsisinteger ST_NPoints(geometry g1);DescriptionReturn the number of points in a geometry. Works for all geometries.NotePrior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+This function supports 3d and will not drop the z-index.This method supports Circular Strings and Curves