1. Professor, State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan Univ., Wuhan 430079, China.
2. Ph.D. Candidate, State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan Univ., Wuhan 430079, China (corresponding author).
3. Professor, School of Remote Sensing and Information Engineering, Wuhan Univ., Wuhan 430079, China.
4. Engineer, State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan Univ., Wuhan 430079, China.