1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2. Wenzhou Institute of Geotechnical Investigation, Surveying and Mapping, Wenzhou 325000, China
3. Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Hong Kong 999077, China
4. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China
5. Zhuhai Surveying and Mapping Institute, Zhuhai 519000, China