1. a State Key Laboratory of Remote Sensing Science , Jointly Sponsored by the Institute of Remote Sensing Applications of the Chinese Academy of Sciences and Beijing Normal University , Beijing , 100101 , PR China
2. b Beijing Institute of Space Mechanics and Electricity , Beijing , 100076 , PR China
3. c Graduate School of the Chinese Academy of Sciences , Beijing , 100049 , PR China
4. d Research Institute of Forest Resources and Information Techniques , Chinese Academy of Forestry , Beijing , 10009 , PR China
5. e Centre for Earth Observation and Digital Earth, Chinese Academy of Sciences , Beijing , 100190 , PR China
6. f National Remote-sensing Centre of China , Beijing , 100862 , PR China
7. g Department of Industry Design, College of Architecture and Urban Planning, Beijing University of Technology , Beijing , 100124 , PR China