1. School of Geodesy and Geomatics, Wuhan University, Wuhan, China
2. School of Geodesy and Geomatics, Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Hubei Luojia Laboratory, Wuhan University, Wuhan, China
3. College of Geomatics, Xi’an University of Science and Technology, Xi’an, China
4. China Three Gorges Projects Development Company Ltd., Chengdu, China
5. Changjiang Spatial Information Technology Engineering Company Ltd., Changjiang Institute of Survey, Planning, Design and Research, Wuhan, China