1. International Institute for Earth System Science and the Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing, China
2. Department of Remote Sensing, College of Geomatics, Xi’an University of Science and Technology, Xi’an, China
3. Key Laboratory of Computational Optical Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
4. Department of Information Engineering and Computer Science, University of Trento, Trento, Italy