1. Chinese Academy of Sciences,Key Laboratory of Digital Earth Science, Aerospace Information Research Institute,Beijing,China,100094
2. Chinese Academy of Sciences,Joint Research Center for Arctic Observations, Aerospace Information Research Institute, Chinese Academy of Sciences and Arctic Space Center, Finnish Meteorological Institute (JRC-AO),Sodankylä,Finland,Fl-99600
3. Chinese Academy of Sciences,National Space Science Center,Beijing,China,100190