1. School of Computer Science, Hubei University of Technology, Wuhan, China
2. Geographic Information Center, GuangZhou Urban Planning & Design Survey Research Institute, Guangzhou, China
3. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
4. School of Information Science and Engineering, Wuchang Shouyi University, Wuhan, China
5. The Institute of Technological Sciences, Wuhan University, Wuhan, China