STArea (geometry Data Type)

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2012)yesAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

Returns the total surface area of a geometry instance.


.STArea ( )  

Return Types

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;

See Also

OGC Methods on Geometry Instances