1. School of Computer Science, Hubei University of Education, Wuhan, China
2. School of Computer Science, Hubei University of Science and Technology, Xianning, China
3. School of Electronic Information, Wuhan University, Wuhan, China
4. State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, Wuhan, China
5. Beijing Qingtai Data Technology Co., Ltd., Beijing, China