public ISpatialReference getSpatialReference_byCode(int srid)
        {
            ISpatialReference spatialReference;
            ISpatialReferenceFactory sr_factory = new SpatialReferenceEnvironmentClass();
            try
            {
                spatialReference = sr_factory.CreateGeographicCoordinateSystem(srid);
            }
            catch
            {
                try
                {
                    spatialReference = sr_factory.CreateProjectedCoordinateSystem(srid);
                }
                catch
                {
                    throw new NotImplementedException("This is an unkown Spatial Reference");
                }
            }

            return spatialReference;
        }