STLength (geometry Data Type)

Returns the total length of the elements in a geometry instance.

.STLength ( )

SQL Server return type: float

CLR return type: SqlDouble

If a geometry instance is closed, its length is calculated as the total length around the instance; the length of any polygon is its perimeter and the length of a point is 0. The length of any geometry collection type is the sum of the lengths of its contained geometry instances.

The following example creates a LineString instance and uses STLength() to find the length of the instance.

DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 1 0)', 0);
SELECT @g.STLength();

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