1. School of Geography, Nanjing Normal University, Nanjing, China
2. Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Ministry of Education, Nanjing, China
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China
4. Nanjing Center, China Geological Survey, Nanjing, China
5. Jinan Rail Transit Group Co. Ltd, Jinan, China