PostGIS

ST_NPoints
Prev	8.4. Geometry Accessors	Next

ST_NPoints

8.4. Geometry Accessors

Name

ST_NPoints — Returns the number of points (vertices) in a geometry.

Synopsis

+integer +ST_NPoints(+`geometry `+g1`)`;

Description

Return the number of points in a geometry. Works for all geometries.

Enhanced: 2.0.0 support for Polyhedral surfaces was introduced.

Prior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+

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

check This method supports Circular Strings and Curves

check This function supports Polyhedral surfaces.

Examples

SELECT ST_NPoints(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)'));
--result
4

--Polygon in 3D space
SELECT ST_NPoints(ST_GeomFromEWKT('LINESTRING(77.29 29.07 1,77.42 29.26 0,77.27 29.31 -1,77.29 29.07 3)'))
--result
4

PostGIS

Name

Synopsis

Description

Examples

See Also