SQL Server 2008 Books Online (November 2009)
STBuffer (geography Data Type)

Returns a geography object that represents the union of all points whose distance from a geography instance is less than or equal to a specified value.

Syntax

.STBuffer ( distance )
Arguments

distance

Is a value of type float (double in the .NET Framework) specifying the distance from the geography instance around which to calculate the buffer.

Return Types

SQL Server return type: geography

CLR return type: SqlGeography

Remarks

STBuffer() calculates a buffer in the same manner as BufferWithTolerance, specifying tolerance = distance * .001 and relative = false.

A negative buffer removes all points within the given distance of the boundary of the geography instance.

Examples

The following example creates a LineString geography instance. It then uses STBuffer() to return the region within 1 meter of the instance.

DECLARE @g geography;
SET @g = geography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656)', 4326);
SELECT @g.STBuffer(1).ToString();
See Also

Reference

BufferWithTolerance (geography Data Type)

Other Resources

OGC Methods on Geography Instances

Help and Information

Getting SQL Server 2008 Assistance
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