InstanceOf (geometry Data Type)
A method that tests if the geometry instance is the same as the specified type. Returns 1 if the type of a geometry instance is the same as the specified type, or if the specified type is an ancestor of the instance type; otherwise, returns 0.
The input for the method must be one of the following: Geometry, Point, Curve, LineString, CircularString, CompoundCurve, Surface, Polygon, CurvePolygon, GeometryCollection, MultiSurface, MultiPolygon, MultiCurve, MultiLineString, and MultiPoint. This method throws an ArgumentException if any other strings are used for the input.
The following example creates a MultiPoint instance and uses InstanceOf() to see if the instance is a GeometryCollection.
DECLARE @g geometry; SET @g = geometry::STGeomFromText('MULTIPOINT(0 0, 13.5 2, 7 19)', 0); SELECT @g.InstanceOf('GEOMETRYCOLLECTION');