1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
2. National Key Laboratory of Automatic Target Recognition, College of Electrical Science and Technology, National University of Defense Technology, Changsha, China
3. School of Computer Science, National Engineering Research Center for Multimedia Software, Institute of Artificial Intelligence, and the Hubei Key Laboratory of Multimedia and Network Communication Engineering, Wuhan University, Wuhan, China
4. Aerospace Information Research Institute, Henan Academy of Sciences, Zhengzhou, China