8Wu H. Topological Selections in B road Sense. In Proceedings of the 16th ICA?ACI International Cartographic Conference. Germany: Co logne?Koeln, 1993. 349-356.
9Li Chengming, Chen Jun Voronoi generation of the noodle object based on dynamic distance transformation [J ]. RemoteSensing Information, 2000, (1) : 6-11.