STIsClosed (geography Data Type)

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance

Returns 1 if the start and end points of the given geography instance are the same. Returns 1 for geography collection types if each contained geography instance is closed. Returns 0 if the instance is not closed.

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


.STIsClosed ( )  


To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.

Return Types

SQL Server return type: bit

CLR return type: SqlBoolean


This method returns 0 if any figures of a geography instance are points, or if the instance is empty.

This method returns true if a FullGlobe instance is a Polygon or other type of instance.

All Polygon instances are considered closed.


The following example creates a Polygon instance and uses STIsClosed() to test if the Polygon is closed.

DECLARE @g geography;  
SET @g = geography::STGeomFromText('POLYGON((-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653))', 4326);  
SELECT @g.STIsClosed();  

See Also

OGC Methods on Geography Instances