1. Jiangsu Provincial Key Laboratory of Geographic Information Technology, School of Geography and Ocean Science, Nanjing University, Nanjing, People’s Republic of China
2. Department of Geographic Information Science, Nanjing University, Nanjing, People’s Republic of China
3. Collaborative Innovation Center for the South Sea Studies, Nanjing University, Nanjing, People’s Republic of China
4. Guangzhou Urban Planning & Design Survey Research Institute, Guangzhou, People’s Republic of China