Graph Analyses of Phone-Based Origin-Destination Data for Understanding Urban Human Mobility in Seoul, Korea

High ownership rate of smartphones in South Korea makes the phone-based human mobility information reliable. By creating a large directed graph, the dynamic of urban human mobility can be interpreted. In this research, graph analysis was applied to origin destination (O-D) data of Seoul, South Korea with a spatial resolution of 250m, which was generated from phone-based mobility data. Two days, April 18 and 21, 2018, were selected for comparative analysis of human mobility between weekday and weekend. Seven indices were used for node-based and link-based graph analysis. As results, we identified the differences between the patterns of two dates: (1) human mobility was more active in the weekdays than in the weekends (2) heterogeneity in human mobility of weekends was higher than weekdays. The peak hours of the connectivity and floating population on weekdays and weekends are different as well. The result of this research is expected to contribute to public policy decision-making and urban planning.