1. School of Geographic and Environment Science, Tianjin Normal University, Tianjin, China
2. Beijing Institute of Control Engineering, Beijing, China
3. Chinese Academy of Surveying and Mapping, Beijing, China
4. Beijing Advanced Innovation Centre for Imaging Theory and Technology, Capital Normal University, Beijing, China
5. Institute of Geo-information and Earth Observation (IGEO), PMAS-Arid Agriculture University, Rawalpindi, Pakistan
6. College of Civil Engineering, Henan University of Engineering, Zhengzhou, China