1. School of Computer Science, China University of Geosciences, Wuhan, China
2. State Key Laboratory of Geo-information Engineering, Xi’an, China
3. School of Geography and Information Engineering, China University of Geosciences, Wuhan, China
4. National Engineering Research Center of Geographic Information System, China University of Geosciences, Wuhan, China
5. Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd, Wuhan, China