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STConvexHull (geometry Data Type)
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STConvexHull (geometry Data Type)


Applies To: SQL Server 2014, SQL Server 2016 Preview

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();

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