'Returns the OSR SpatialReference for SRID of this Geometry.'

@property
def srs(self):

    if (not gdal.HAS_GDAL):
        raise GEOSException(u'GDAL    required    to    return    a    SpatialReference    object.')
    if self.srid:
        try:
            return gdal.SpatialReference(self.srid)
        except SRSException:
            pass
    return None
