STConvexHull (geometry Data Type)


Returns an object representing the convex hull of a geometry instance.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.
.STConvexHull ( )  

SQL Server return type: geometry

CLR return type: SqlGeometry

STConvexHull() returns the smallest convex polygon that contains the given geometry instance. Points or co-linear LineString instances will produce an instance of the same type as that of the input.

The following example uses STConvexHull() to find the convex hull of a non-convex Polygon``geometry instance.

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

OGC Methods on Geometry Instances

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