1. College of General Aviation and Flight, Nanjing University of Aeronautics and Astronautics, Liyang, China
2. Jiangsu Key Laboratory of Urban ITS, Southeast University, Nanjing, China
3. Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, Southeast University, Nanjing, China
4. School of Transportation, Southeast University, Nanjing, China
5. Department of Geography, Ghent University, Ghent, Belgium