1. INRAE, UMR1391 ISPA,Villenave d'Ornon,France
2. University of Valencia,Image Processing Lab (IPL),Valencia,Spain
3. Southwest University,Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences,Chongqing,China,400715
4. KU Leuven,Department of Earth and Environmental Sciences,Heverlee,Belgium,B-3001
5. Zhengzhou University,School of Geoscience and Technology,China,450001