STDistance (geometry Data Type)

 

Returns the shortest distance between a point in a geometry instance and a point in another geometry instance.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.
  
.STDistance ( other_geometry )  

other_geometry
Is another geometry instance from which to measure the distance between the instance on which STDistance() is invoked. If other_geometry is an empty set, STDistance() returns null.

SQL Server return type: float

CLR return type: SqlDouble

STDistance() always returns null if the spatial reference IDs (SRIDs) of the geometry instances do not match.

DECLARE @g geometry;  
DECLARE @h geometry;  
SET @g = geometry::STGeomFromText('POLYGON((0 0, 2 0, 2 2, 0 2, 0 0))', 0);  
SET @h = geometry::STGeomFromText('POINT(10 10)', 0);  
SELECT @g.STDistance(@h);  

Spatial Indexes Overview
OGC Methods on Geometry Instances

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