1. School of Marine Science, Shanghai Ocean University, Shanghai 201306, China
2. Marine Surveying and Mapping Engineering and Technology Research Center, Shanghai 201306, China
3. School of Information Science and Technology, Hainan Normal University, Haikou 571158, China
4. States Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China