ST_3DArea
Name
ST_3DArea — Computes area of 3D surface geometries. Will return 0 for solids.
Synopsis
float
ST_3DArea
(
geometry
geom1
)
;
Description
Availability: 2.1.0
This method needs SFCGAL backend.
This method implements the SQL/MM specification.
SQL-MM IEC 13249-3: 8.1, 10.5
This function supports 3d and will not drop the z-index.
This function supports Polyhedral surfaces.
This function supports Triangles and Triangulated Irregular Network Surfaces (TIN).
Examples
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