SqlGeography.STBuffer Method (Double)
Returns a geography object that represents the union of all points whose distance from a SqlGeography instance is less than or equal to a specified value.
Assembly: Microsoft.SqlServer.Types (in Microsoft.SqlServer.Types.dll)
[SqlMethodAttribute(IsDeterministic = true, IsPrecise = false)] public SqlGeography STBuffer( double distance )
Is a double that specifies the distance from the geography instance around which to calculate the buffer.
Themethod 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 SqlGeography instance.
The following example creates a LineString geography instance. It then uses themethod to return the region within 1 meter of the instance.
DECLARE @g SqlGeography; SET @g = SqlGeography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656)', 4326); SELECT @g.STBuffer(1).ToString();