'Returns a cascaded union of this MultiPolygon.'

@property
def cascaded_union(self):

    if GEOS_PREPARE:
        return GEOSGeometry(capi.geos_cascaded_union(self.ptr), self.srid)
    else:
        raise GEOSException('The    cascaded    union    operation    requires    GEOS    3.1+.')
