Hongliang Ma, State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, China; Jiangyuan Zeng, Aerospace Information Research Institute, Chinese Academy of Sciences, China; Nengcheng Chen, Xiang Zhang, National Engineering Research Center of Geographic Information System, China University of Geosciences (Wuhan), China; Xiaojun Li, Jean-Pierre Wigneron, INRAE, UMR1391 ISPA, Université de Bordeaux, France