1. a The Key Laboratory of Remote Sensing Science , Institute of Remote Sensing Applications , Chinese Academy of Science , Beijing Normal University , Beijing , 100101 , China
2. b International Institute for Earth System , Nanjing University , Nanjing , 210093 , China
3. c The Key Laboratory of Remote Sensing and Digital Agriculture , China Ministry and the Agriculture Remote Sensing Laboratory , Beijing , 100081 , China
4. d University of California , Santa Barbara , California 93106
5. e University of California at Berkeley , California 94720