1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, People’s Republic of China
2. School of Geographic Sciences, Xinyang Normal University, Xinyang, People’s Republic of China
3. Institute of Remote Sensing and Geographical Information Systems, School of Earth and Space Sciences, Peking University, Beijing, People’s Republic of China
4. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, People’s Republic of China