1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China
2. Space Science Institute, Macao University of Science and Technology, Macao, China
3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
5. CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China