1. School of Navigation, Wuhan University of Technology, Wuhan 430063, China
2. Sanya Science and Education Innovation Park of Wuhan University of Technology, Sanya 572000, China
3. State Key Laboratory of Maritime Technology and Safety, Wuhan University of Technology, Wuhan 430063, China
4. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
5. National Engineering Research Center for Geographic Information System, China University of Geosciences (Wuhan), Wuhan 430074, China
6. Hainan Strait Shipping Co., Ltd., Haikou 570311, China
7. Department of Geography, University of California at Santa Barbara, Santa Barbara, CA 93106, USA