1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
2. Science & Technology Innovation Center, Shenzhen Urban Transport Planning Center Co., Ltd, Shenzhen, Guangdong, China
3. Traffic Information Engineering & Technology Research Center of Guangdong Province, Shenzhen, Guangdong, China
4. School of Geosciences, China University of Petroleum, Qingdao, China
5. Department of Geography and the Environment, University of Denver, Denver, CO, USA