1. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, China
2. School of Remote Sensing and Information Engineering and the State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
3. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China
4. Institute of Mineral Resources, China Metallurgical Geology Bureau, Beijing, China