1. Aerospace Information Research Institute, Chinese Academy of Sciences,Key Laboratory of Digital Earth Science,Beijing,China,100094
2. Utah State University,Quinney College of Natural Resources,Department of Environment and Society,Logan,UT,USA,84322
3. Beihang University,School of Software,Beijing,China,100191
4. Ministry of Emergency Management of China,National Institute of Natural Hazards,Beijing,China,100085