stcentroid-geometry-data-type.md

title	description	author	ms.author	ms.date	ms.service	ms.subservice	ms.topic	f1_keywords	helpviewer_keywords	dev_langs	monikerRange
STCentroid (geometry Data Type)	STCentroid (geometry Data Type)	MladjoA	mlandzic	08/03/2017	sql	t-sql	reference	STCentroid_TSQL STCentroid (geometry Data Type)	STCentroid (geometry Data Type)	TSQL	=azuresqldb-current||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current||=fabric

STCentroid (geometry Data Type)

[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance FabricSE FabricDW]

Returns the geometric center of a geometry instance that consists of one or more polygons.

Syntax

  
.STCentroid ( )  

[!INCLUDEsql-server-tsql-previous-offline-documentation]

Return Types

[!INCLUDEssNoVersion] 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, CurvePolygon, or MultiPolygon type.

Examples

A. Computing the centroid of a Polygon instance

The following example uses STCentroid() to compute the centroid of a polygon``geometry instance:

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();  

B. Computing the centroid of a CurvePolygon instance

The following example computes the centroid for a CurvePolygon instance:

 DECLARE @g geometry = 'CURVEPOLYGON(CIRCULARSTRING(0 4, 4 0, 8 4, 4 8, 0 4), CIRCULARSTRING(2 4, 4 2, 6 4, 4 6, 2 4))';  
 SELECT @g.STCentroid().ToString() AS Centroid

See Also

OGC Methods on Geometry Instances