@property
    def srid(self):
        try:
            return int(self.attr_value('AUTHORITY', 1))
        except (TypeError, ValueError):
            return None

    #### Unit Properties ####
Returns the SRID of top-level authority, or None if undefined.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/gis/gdal/srs.py/SpatialReference.srid