UrbanGen: Generating Combined In- and Outdoor Trajectories

The prevalence of mobile devices and positioning techniques has enabled so-called traffic-aware urban computing. In urban daily life, people's activities consist of indoor and outdoor parts whose transitions have important impacts on traffic behavior. For example, outdoor traffic events (e.g., jams) can be triggered by indoor events (e.g., the ending of exhibitions, tour-naments, or working hours). In turn, indoor events (e.g., subway jams) can also be affected by outdoor events (e.g., snowy weather or other bad outdoor traffic conditions). For a wide range of applications like traffic monitoring and emergency response, it is thus interesting to develop techniques for analyzing data in an integrated indoor and outdoor space. Since real datasets of this kind are still scarce and small, a suitable data generator is needed for both functional and scalability testing. In this work, we present UrbanGen, which follows the constraints of road networks for the outdoor space and the constraints of topologies for the indoor space. The system provides the functionalities including: 1) integrating a model of indoor topologies with the state-of-art road networks; 2) parameterizing the movement of objects in the integrated model; 3) serializing and visualizing the generated trajectories.