[1] Chinese Acad Sci, Inst Tibetan Plateau Res, Lab Tibetan Environm Changes & Land Surface Proc, Beijing 100085, Peoples R China
[2] Chinese Acad Sci, Inst Remote Sensing Applicat, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China
[3] Univ Tubingen, Phys Geog & GIS, Geograph Inst, D-72070 Tubingen, Germany
[4] Univ Waterloo, Dept Geog & Environm Management, Fac Environm, Waterloo, ON N2L 3G1, Canada