1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou, People’s Republic of China
2. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, People’s Republic of China
3. National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou, People’s Republic of China
4. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou, People’s Republic of China
5. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, People’s Republic of China
6. IMAS-Hobart, University of Tasmania, Tasmania, Australia
7. School of Geography and Ocean Sciences, Nanjing University, Nanjing, People’s Republic of China