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STConvexHull (geometry Data Type)

Applies To: SQL Server 2014, SQL Server 2016 Preview

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

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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