1. School of Geography Science, Nanjing Normal University, Nanjing 210023, China
2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China
4. University of Chinese Academy of Science, Beijing 100049, China