1. School of Geography and Information Engineering, China University of Geosciences, Wuhan, China
2. Key Laboratory of Geological Survey and Evaluation of Ministry of Education, China University of Geosciences, Wuhan, China
3. School of Geodesy and Geomatics, Wuhan University, Wuhan, China
4. Naval Institute of Hydrographic Surveying and Charting, Tianjin, China