@property
    def null_srid(self):
        info = geos_version_info()
        if info['version'] == '3.0.0' and info['release_candidate']:
            return -1
        else:
            return None
Returns the proper null SRID depending on the GEOS version.
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/contrib/gis/geos/tests/test_geos.py/GEOSTest.null_srid