1. Department of State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
2. Computer Science Department, The University of Hong Kong, Hong Kong, China
3. Department of Computer Science, University of Oxford, Oxford, U.K.
4. Department of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Hong Kong, China
5. DiDi Chuxing, Beijing, China
6. School of Electronics and Communication Engineering, the Shenzhen Campus of Sun Yat-sen University, Sun Yat-sen University, Guangzhou, China
7. Department of Visualization, Texas A&M University, College Station, TX, USA