ST_3DPerimeter
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## 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

## See Also

ST_GeomFromEWKT, ST_Perimeter, ST_Perimeter2D

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