[1] St Louis Univ, Ctr Environm Sci, St Louis, MO 63103 USA
[2] LSIIT, UMR7005, F-67400 Illkirch Graffenstaden, France
[3] Peking Univ, Inst Remote Sensing, Beijing 100871, Peoples R China
[4] Peking Univ, GIS, Beijing 100871, Peoples R China
[5] Xinjiang Univ, Sch Resources & Environm Sci, Urumqi 830046, Peoples R China
[6] Natl Engn Res Ctr Informat Technol Agr, Beijing 100089, Peoples R China
[7] Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China