Z (geography Data Type)

APPLIES TO: yesSQL Server (starting with 2008) yesAzure SQL Database noAzure SQL Data Warehouse noParallel Data Warehouse

The Z (elevation) value of the instance. The semantics of the elevation value are user-defined.



Return Types

SQL Server type: float

CLR type: SqlDouble


The value of this property is null if the geography instance is not a point, as well as for any Point instance for which it is not set.

This property is read-only.

Z-coordinates are not used in any calculations made by the library and are not carried through any library calculations.


The following example creates a Point instance with Z (elevation) and M (measure) values and uses Z to fetch the Z value of the instance.

DECLARE @g geography;  
SET @g = geography::STGeomFromText('POINT(-122.34900 47.65100 10.3 12)', 4326);  
SELECT @g.Z;  

See Also

Extended Methods on Geography Instances
M (geography Data Type)
AsTextZM (geography Data Type)