grid_service.py 文件源码

def _dissolve(geoms: MultiPolygon) -> MultiPolygon:
        """
        dissolves a Multipolygons
        :return: Multipolygon
        """
        # http://toblerity.org/shapely/manual.html#shapely.ops.cascaded_union
        geometry = cascaded_union(geoms)
        if geometry.geom_type == 'Polygon':
            # shapely may return a POLYGON rather than a MULTIPOLYGON if there is just one shape
            # force Multipolygon
            geometry = MultiPolygon([geometry])
        return geometry