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STBoundary (geometry Data Type)

Returns the boundary of a geometry instance.

.STBoundary ( )

SQL Server return type: geometry

CLR return type: SqlGeometry

STBoundary() returns an empty GeometryCollection when the endpoints for a LineString, CircularString, or CompoundCurve instance are the same.

A. Using STBoundary() on a LineString instance with different endpoints

The following example creates a LineString geometry instance. STBoundary() returns the boundary of the LineString.

DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 0 2, 2 0)', 0);
SELECT @g.STBoundary().ToString();

B. Using STBoundary() on a LineString instance with the same endpoints

The following example creates a valid LineString instance with the same endpoints. STBoundary() returns an empty GeometryCollection.

DECLARE @g geometry;

SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 0 2, -2 2, 0 0)', 0);

SELECT @g.STBoundary().ToString();

C. Using STBoundary() on a CurvePolygon instance

The following example uses STBoundary() on a CurvePolygon instance. STBoundary() returns a CircularString instance.

DECLARE @g geometry;

SET @g = geometry::STGeomFromText('CURVEPOLYGON(CIRCULARSTRING(0 0, 2 2, 0 2, -2 2, 0 0))', 0);

SELECT @g.STBoundary().ToString();

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