1. School of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2. School of Computer Science and Technology, Anhui University of Technology, Ma’anshan, China
3. School of Geospatial Engineering and Science, Sun Yat-Sen University, Zhuhai, China
4. Department of Computing and Decision Sciences, Lingnan University, Hong Kong, China
5. School of Science and Technology, Hong Kong Metropolitan University, Hong Kong, China
6. Department of Geography and Environmental Management and the Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, Canada