1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China
2. Institute of Cartography and Geographic Information System, Chinese Academy of Surveying and Mapping, Beijing, China
3. Geographic Information Branch, Jinan Academy of Surveying and Mapping Research, Jinan, China
4. State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and Ministry of Science & Technology, Shandong University of Science and Technology, Qingdao, China
5. Laboratory of Digital Earth Science, Center for Earth Observation and Digital Earth, University of Chinese Academy of Sciences, Beijing, China