1. School of Geography Science and Geomatics Engineering, Suzhou University of Science and Technology, Suzhou, People’s Republic of China
2. National Space Institute, Technical University of Denmark, Kongens Lyngby, Denmark
3. School of Resources and Civil Engineering, Northeastern University, Shenyang, China
4. School of Geodesy and Geomatics, Wuhan University, Wuhan, People’s Republic of China