1. Key Laboratory of Virtual Geographic Environment (Ministry of Education of PRC), Nanjing Normal University, Nanjing, China
2. School of Transportation and Geomatics Engineering, Shenyang Jianzhu University, Shenyang, China
3. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing Normal University, Nanjing, Jiangsu, China
4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, Jiangsu, China
5. School of Environment, Nanjing Normal University, Nanjing, China
6. School of Surveying and Mapping Engineering, Liaoning Vocational College of Ecological Engineering, Shenyang, China