Name
CG_Area — Calculates the area of a geometry
Synopsis
double precision CG_Area( geometry geom );
描述
Calculates the area of a geometry.
Performed by the SFCGAL module
![[Note]](../images/note.png)
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NOTE: this function returns a double precision value representing the area. |
可用性：3.5.0
该方法需要SFCGAL后端。
几何示例
SELECT CG_Area('Polygon ((0 0, 0 5, 5 5, 5 0, 0 0), (1 1, 2 1, 2 2, 1 2, 1 1), (3 3, 4 3, 4 4, 3 4, 3 3))');
cg_area
--------
25
(1 row)