1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
2. Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng, China
3. Institute of West-Asian and African Studies, Chinese Academy of Social Sciences, Beijing, China
4. School of Resource and Environmental Sciences, Wuhan University, Wuhan, China