1. College of Geography and Remote Sensing, Hohai University, Nanjing, People’s Republic of China
2. School of Geography and Tourism, Anhui Normal University, Wuhu, People’s Republic of China
3. Institute of Urban Studies, School of Environmental and Geographical Sciences, Shanghai Normal University, Shanghai, People’s Republic of China
4. Engineering Technology Research Center of Resource Environment and GIS, Wuhu, People’s Republic of China
5. Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Nanjing, People’s Republic of China
6. College of Letters and Science, University of California, Santa Barbara, CA, USA