1. State Key Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, People's Republic of China
2. School of General Aviation, Jingchu University of Technology, Jingmen, People's Republic of China
3. Hubei Key Laboratory of Intelligent Robot, Wuhan Institute of Technology, Wuhan, People's Republic of China
4. Department of Engineering, University of Durham, Durham, UK
5. Department of Environmental Sciences, Emory University, Atlanta, GA, USA
6. School of Computer Science and Technology, Harbin Institute of Technology, Harbin, People's Republic of China
7. NERCMS, School of Computer Science, Wuhan University, Wuhan, People's Republic of China