1. Shandong Institute of Geological Survey , Jinan 250014 , China
2. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education , Nanjing 210023 , China
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application , Nanjing 210023 , China
4. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing Normal University , Nanjing 210023 , China