1. Department of Geographic Information Science, School of Geography and Ocean Science, Nanjing University, Nanjing, Jiangsu, China
2. Collaborative Innovation Center of South China Sea Studies, Nanjing, Jiangsu, China
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, Jiangsu, China
4. Department of Civil Engineering, Monash University, Clayton, Australia