Name
ST_3DPerimeter — Returns the 3D perimeter of a polygonal geometry.
Synopsis
float ST_3DPerimeter(geometry geomA);
Description
Returns the 3-dimensional perimeter of the geometry, if it is a polygon or multi-polygon. If the geometry is 2-dimensional, then the 2-dimensional perimeter is returned.
This function supports 3d and will not drop the z-index.
This method implements the SQL/MM specification. SQL-MM ISO/IEC 13249-3: 8.1, 10.5
Changed: 2.0.0 In prior versions this used to be called ST_Perimeter3D
Examples
Perimeter of a slightly elevated polygon in the air in Massachusetts state plane feet
SELECT ST_3DPerimeter(geom), ST_Perimeter2d(geom), ST_Perimeter(geom) FROM
(SELECT ST_GeomFromEWKT('SRID=2249;POLYGON((743238 2967416 2,743238 2967450 1,
743265.625 2967416 1,743238 2967416 2))') As geom) As foo;
ST_3DPerimeter | st_perimeter2d | st_perimeter
------------------+------------------+------------------
105.465793597674 | 105.432997272188 | 105.432997272188