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

@property
def srs(self):

    if gdal.HAS_GDAL:
        if self.srid:
            return gdal.SpatialReference(self.srid)
        else:
            return None
    else:
        raise GEOSException(u'GDAL    required    to    return    a    SpatialReference    object.')
