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STArea (geometry Data Type)

Returns the total surface area of a geometry instance.

.STArea ( )

SQL Server return type: float

CLR return type: SqlDouble

STArea() returns 0 if a geometry instance contains only 0- and 1-dimensional figures, or if it is empty. STArea() returns NULL if the geometry instance has not been initialized.

A. Computing the area of a Polygon instance

The following example creates a Polygon geometry instance and computes the area of the polygon.

DECLARE @g geometry;
SET @g = geometry::STGeomFromText('POLYGON((0 0, 3 0, 3 3, 0 3, 0 0),(2 2, 2 1, 1 1, 1 2, 2 2))', 0);
SELECT @g.STArea();

B. Computing the area of a CurvePolygon instance

The following example computes the area of a CurvePolygon instance.

DECLARE @g geometry;

SET @g = geometry::Parse('CURVEPOLYGON(CIRCULARSTRING(0 2, 2 0, 4 2, 4 2, 0 2))');

SELECT @g.STArea() AS Area;

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