1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
2. Institute of Geographic Sciences and Natural Resources Research, University of Chinese Academy of Sciences, Beijing, China
3. School of Geological Engineering and Geomatics, Chang’an University, Xi’an, China
4. College of Resource Environment and Tourism, Capital Normal University, Beijing, China
5. Department of Geology & Geography, West Virginia University, Morgantown, WV, USA
6. Department of Earth Sciences, Simon Fraser University, Burnaby, Canada