1. a State Key Laboratory of Resources and Environmental Information System , Institute of Geographic Sciences and Natural Resources Research , Beijing , 100101 , PR China
2. b LSIIT, UdS, CNRS, Boulevard Sebastien Brant , BP10413, 67412 , Illkirch , France
3. c Graduate University of Chinese Academy of Sciences , Beijing , 100049 , PR China
4. d GCU/Image Processing Laboratory , University of Valencia , Valencia , 46071 , Spain
5. e ICESS, University of California , Santa Barbara , CA , 93106 , USA
6. f State Key Laboratory of Remote Sensing Sciences , School of Geography, Beijing Normal University , Beijing , 100875 , PR China