1. College of Artificial Intelligence, National University of Defense Technology, Changsha, China;
2. Naval Institute of Hydrographic Surveying and Charting, Tianjin, China;
3. College of Geomatics, Shandong University of Science and Technology, Qingdao, China;
4. Department of Hydrography and Cartography, Dalian Naval Academy, Dalian, China;
5. Xi'an Institute of Surveying and Mapping, Xi'an, China