1. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing, China
2. Collaborative Innovation Center for the South Sea Studies, Nanjing University, Nanjing, China
3. School of Geography and Ocean Science, Nanjing University, Nanjing, China
4. Collaborative Innovation Center of Novel Software Technology and Industrialization, Nanjing University, Nanjing, China
5. Defense Engineering Institute Academy of Military Sciences, Beijing, China