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STDimension (geography Data Type)

Returns the maximum dimension of a geography instance.


.STDimension ( )

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 geography instance.

name

dim

Point

0

LineString

1

Polygon

2

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