def create_vertex_index(self, params):
        raise NotImplementedError
Returns the SRID of top-level authority, or None if undefined.
dataset/ETHPy150Open espeed/bulbs/bulbs/base/client.py/Client.create_vertex_index--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/gis/gdal/srs.py/SpatialReference.srid