z-geometry-data-type.md

title	description	author	ms.author	ms.date	ms.service	ms.subservice	ms.topic	f1_keywords	helpviewer_keywords	dev_langs
Z (geometry Data Type)	Z (geometry Data Type)	MladjoA	mlandzic	08/03/2017	sql	t-sql	reference	Z (geometry Data Type) Z_(geometry_Data_Type)_TSQL	Z (geometry Data Type)	TSQL

Z (geometry Data Type)

[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance]

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

Syntax

  
.Z  

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Return Types

[!INCLUDEssNoVersion] type: float

CLR type: SqlDouble

Remarks

The value of this property will be null if the geometry 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 is not carried through any library calculations.

Examples

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 geometry;  
SET @g = geometry::STGeomFromText('POINT(1 2 3 4)', 0);  
SELECT @g.Z;  

See Also

M (geometry Data Type)
AsTextZM (geometry Data Type)
Extended Methods on Geometry Instances