1. Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences; Lanzhou University; Lanzhou China
2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute; Chinese Academy of Sciences; Lanzhou China
3. Chinese Antarctic Center of Surveying and Mapping; Wuhan University; Wuhan China
4. Institute of Arctic and Alpine Research; University of Colorado Boulder; Boulder CO USA
5. Key Laboratory of Remote Sensing of Gansu Province, Cold and Arid Regions Environmental and Engineering Research Institute; Chinese Academy of Sciences; Lanzhou China