7KONECNY M. The Digital Earth: Spatial Data Infrastructures from Local to Global Concept [ C ] //Towards Digital Earth--Proceedings of the International Symposium on Digital Earth. Beijing: [s. n. ] ,1999:57-68.
8WU Qishi. The Application of Genetic Algorithm in GIS Network Analysis [ J ]. International Archives of Photogrammetry and RS,2000,33 : 1184-1191.