College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;
StateKey Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
MOE Key Laboratory of Regional Energy Systems Optimization, Sino-Canada Resources and Environmental ResearchAcademy, North China Electric Power University, Beijing 102206, China;
Xinjiang Remote Sensing Center, Urumqi 830011, China;