STDimension (geography Data Type)

Applies to: yesSQL Server (all supported versions) YesAzure SQL Database YesAzure SQL Managed Instance

Returns the maximum dimension of a geography instance.


.STDimension ( )  


To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.

Return Types

SQL Server return type: int

CLR return type: SqlInt32


STDimension() returns -1 if the geography instance is empty.


The following example uses STDimension() to create a table variable to hold geography instances, and inserts a Point, a LineString, and a Polygon.

DECLARE @temp table ([name] varchar(10), [geom] geography);  
INSERT INTO @temp values ('Point', geography::STGeomFromText('POINT(-122.34900 47.65100)', 4326));  
INSERT INTO @temp values ('LineString', geography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656)', 4326));  
INSERT INTO @temp values ('Polygon', geography::STGeomFromText('POLYGON((-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653))', 4326));  
SELECT [name], [geom].STDimension() as [dim]  
FROM @temp;  

The example then returns the dimensions of each geographyinstance.

name dim
Point 0
LineString 1
Polygon 2

See Also

OGC Methods on Geography Instances