STCentroid (geometry Data Type)
Returns the geometric center of a geometry instance consisting of one or more polygons.
.STCentroid ( )
Return Types
SQL Server return type: geometry
CLR return type: SqlGeometry
Open Geospatial Consortium (OGC) type: Point
Remarks
STCentroid() returns null if the geometry instance is not a Polygon or MultiPolygon type.
Examples
The following example uses STCentroid() to create a polygongeometry instance and compute its centroid.
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.STCentroid().ToString();