starea-geometry-data-type.md

title	description	author	ms.author	ms.date	ms.service	ms.subservice	ms.topic	f1_keywords	helpviewer_keywords	dev_langs	monikerRange
STArea (geometry Data Type)	STArea (geometry Data Type)	MladjoA	mlandzic	03/14/2017	sql	t-sql	reference	STArea (geometry Data Type) STArea_TSQL	STArea (geometry Data Type)	TSQL	=azuresqldb-current||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current

STArea (geometry Data Type)

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

Returns the total surface area of a geometry instance.

Syntax

  
.STArea ( )  

Return Types

[!INCLUDEssNoVersion] return type: float

CLR return type: SqlDouble

Remarks

STArea() returns 0 if a geometry instance contains only 0- and 1-dimensional figures, or if it is empty. STArea() returns NULL if the geometry instance has not been initialized.

Examples

A. Computing the area of a Polygon instance

The following example creates a Polygon``geometry instance and computes the area of the polygon.

DECLARE @g geometry;  
SET @g = geometry::STGeomFromText('POLYGON((0 0, 3 0, 3 3, 0 3, 0 0),(2 2, 2 1, 1 1, 1 2, 2 2))', 0);  
SELECT @g.STArea();  

B. Computing the area of a CurvePolygon instance

The following example computes the area of a CurvePolygon instance.

 DECLARE @g geometry;  
 SET @g = geometry::Parse('CURVEPOLYGON(CIRCULARSTRING(0 2, 2 0, 4 2, 4 2, 0 2))');  
 SELECT @g.STArea() AS Area;

See Also

OGC Methods on Geometry Instances