Z (geography Data Type)
The Z (elevation) value of the instance. The semantics of the elevation value are user-defined.
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;
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