1. Key Laboratory of Virtual Geographic Environment Faculty of Geography Science Nanjing Normal University Nanjing P.R. China
2. School of Geography and Tourism Anhui Normal University Wuhu P.R. China
3. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province) Nanjing P.R. China
4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing P.R. China