1. Key Laboratory of Technology in Geo-Spatial Information Processing and Application System, Chinese Academy of Sciences, Beijing, China
2. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
3. School of Environmental Science and Engineering, Tiangong University, Tianjin, China
4. Surveying and Mapping Geographic Information Center, Geological Brigade of Shandong Nuclear Industry, Qingdao, Shandong, China
5. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing, China