1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang, China
2. College of Resources and Enviroment, University of Chinese Academy of Sciences, Beijing, China
3. Research Centre for Ecology and Environment of Central Asia, Chinese Academy of Sciences, Urumqi, China
4. Department of Computer Vision & Remote Sensing, Technische Universität, Berlin, Germany
5. School of Geography and Information Engineering, China University of Geosciences, Wuhan, China
6. Department of Geography and Environmental Management, University of Port Harcourt, Port Harcourt, Rivers, Nigeria