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.
.STBuffer ( 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.
SQL Server return type: geography
CLR return type: SqlGeography
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.
The following example creates a LineString geography instance. It then uses STBuffer() to return the region within 1 meter of the instance.
LineString
geography
STBuffer()
DECLARE @g geography; SET @g = geography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656)', 4326); SELECT @g.STBuffer(1).ToString();