Name
ST_NumPatches — Returns the number of faces in a PolyhedralSurface or TIN.
Synopsis
integer ST_NumPatches(geometry g1);
Description
Returns the number of faces in a PolyhedralSurface or TIN. Returns NULL for other geometries. Unlike ST_NumGeometries, this function counts individual faces.
Availability: 2.0.0
This function supports 3d and will not drop the z-index.
This method implements the OGC Simple Features
Implementation Specification for SQL 1.1.
This method implements the SQL/MM specification.
SQL-MM ISO/IEC 13249-3: 8.5
This function supports Polyhedral surfaces.
Examples
Code
SELECT ST_NumPatches('POLYHEDRALSURFACE( ((0 0 0,0 0 1,0 1 1,0 1 0,0 0 0)),
((0 0 0,0 1 0,1 1 0,1 0 0,0 0 0)),((0 0 0,1 0 0,1 0 1,0 0 1,0 0 0)),
((1 1 0,1 1 1,1 0 1,1 0 0,1 1 0)),
((0 1 0,0 1 1,1 1 1,1 1 0,0 1 0)),((0 0 1,1 0 1,1 1 1,0 1 1,0 0 1)) )');
Output
st_numpatches
---------------
6
(1 row)