Name

ST_3DArea — Computes area of 3D surface geometries. Will return 0 for solids.

Synopsis

floatST_3DArea(geometry geom1);

Descrizione

Disponibilità: 2.1.0

Questo metodo richiede il backend SFCGAL.

Questo metodo implementa la specifica SQL/MM. SQL-MM IEC 13249-3: 8.1, 10.5

Questa funzione supporta il 3d e non distrugge gli z-index.

Questa funzione supporta le Polyhedral Surface.

Questa funzione supporta i Triangoli e le Triangulated Irregular Network Surfaces (TIN).

Esempi

Note: By default a PolyhedralSurface built from WKT is a surface geometry, not solid. It therefore has surface area. Once converted to a solid, no area.

SELECT ST_3DArea(geom) As cube_surface_area,
                        ST_3DArea(ST_MakeSolid(geom)) As solid_surface_area
                        FROM (SELECT '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)) )'::geometry) As f(geom);

                        cube_surface_area | solid_surface_area
                        -------------------+--------------------
                                                                                6 |                  0