STUnion (geography Data Type)
Returns an object representing the union of a geography instance with another geography instance.
Syntax
.STUnion ( other_geography )
Arguments
- other_geography
Is another geography instance to form a union with the instance on which STUnion() is being invoked.
Return Types
SQL Server return type: geography
CLR return type: SqlGeography
Remarks
This method always returns null if the spatial reference identifiers (SRIDs) of the geography instances do not match.
Examples
The following example uses STUnion() to compute the union of two Polygon instances.
DECLARE @g geography;
DECLARE @h geography;
SET @g = geography::STGeomFromText('POLYGON((-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653))', 4326);
SET @h = geography::STGeomFromText('POLYGON((-122.351 47.656, -122.341 47.656, -122.341 47.661, -122.351 47.661, -122.351 47.656))', 4326);
SELECT @g.STUnion(@h).ToString();