STIsValid (geography Data Type)
Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance
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.
.STIsValid ( )
To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.
SQL Server return type: bit
CLR return type: SqlBoolean
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
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
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