STIsValid (geography Data Type)

**APPLIES TO:** SQL Server (starting with 2012) Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse

Returns true if a geography instance is well-formed and recognized as a valid geography object based on its Open Geospatial Consortium (OGC) type. Returns false if a geography instance is not well-formed. This method is precise.

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

Syntax

  
.STIsValid ( )  

Return Types

SQL Server return type: bit

CLR return type: SqlBoolean

Remarks

The OGC type of a geography instance can be determined by invoking STGeometryType().

SQL Server produces only valid geography instances, but allows for the storage and retrieval of invalid instances. A valid instance representing the same point set of an invalid instance can be retrieved using the MakeValid() method.

Examples

The following example creates a geography instance and uses STIsValid() to test if the instance is valid.

DECLARE @g geography = geography::STGeomFromText('LINESTRING(0 0, 2 2, 1 0)', 4326);  
SELECT @g.STIsValid();  
DECLARE @g geography  

See Also

STGeometryType (geography Data Type)
MakeValid (geography Data Type)
OGC Methods on Geography Instances