1. School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
2. Key Laboratory of Digital Earth Sciences, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
3. AIR-FMI Joint Research Center for Arctic Observations, Aerospace Information Research Institute, Chinese Academy of Sciences, and Finnish Meteorological Institute, Sodankylä, Finland
4. Department of Geoscience and Remote Sensing, Civil Engineering, Delft University of Technology, Delft, The Netherlands