(a) shows the road network of Changchun city on the map, and the bottom right corner of (a) shows the position of Changchun city in China. (b) shows population, birth rate and mortality of each district in 2014. (c) shows GDP and GDP growth of each district in 2014. (d) shows the heat map of 7,000 taxis distribution at 8:00 am on 5 March 2018. (e) shows the heat map of 1,500 buses distribution at the same time. (f) shows the geographical distribution of bus stations. The spatial map was created using OpenStreetMap online platform (http://www.openstreetmap.org/) (© OpenStreetMap contributors) under the license of CC BY-SA (http://www.openstreetmap.org/copyright). More details of the licence can be found in http://creativecommons.org/licenses/by-sa/2.0/.