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InstanceOf (geography Data Type)

Tests if the geography instance is the same as the specified type.

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

.InstanceOf ( 'geography_type')

geography_type

Is an nvarchar(4000) string specifying one of 16 types exposed in the geography type hierarchy.

SQL Server return type: bit

CLR return type: SqlBoolean

Returns 1 if the type of a geography instance is the same as the specified type, or if the specified type is an ancestor of the instance type; otherwise, returns 0.

This geography data type method supports FullGlobe instances or spatial instances that are larger than a hemisphere.

The input for the method must be one of the following: Geometry, Point, Curve, LineString, CircularString, Surface, Polygon, CurvePolygon, GeometryCollection, MultiSurface, MultiPolygon, MultiCurve, MultiLineString, MultiPoint, or FullGlobe.

This method throws an ArgumentException if any other strings are used for the input.

This method is not precise.

The following example creates a MultiPoint instance and uses InstanceOf() to see whether the instance is a GeometryCollection.

DECLARE @g geography;
SET @g = geography::STGeomFromText('MULTIPOINT(-122.360 47.656, -122.343 47.656)', 4326);
SELECT @g.InstanceOf('GEOMETRYCOLLECTION');
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