1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
2. College of Resources Science and Technology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
3. The Second Surveying and Mapping Institute of Hunan Province, Changsha 410009, China
4. Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China