1. National Engineering Research Center for Geoinformatics, Aerospace Information Research Institute (AIR), Chinese Academy of Sciences, Beijing, People’s Republic of China
2. Zhejiang-CAS Application Center for Geoinformatics, Zhejiang, People’s Republic of China
3. University of Chinese Academy of Sciences, Beijing, People’s Republic of China
4. PLA troops of 63896, Luoyang, People’s Republic of China