MWGen: A Mini World Generator

Moving objects representing movement in all real world environments (e.g., road network, bus network, indoor) should be managed in a database system, for the reason that a person´s trip can cover several environments rather than one. GMOD (Generic Moving Objects Database) is a database system to manage moving objects that (1) travel through different environments; (2) contain multiple transportation modes such as Car → Walk → Indoor. To evaluate the performance of GMOD, one needs a comprehensive and scalable dataset consisting of all available environments and moving objects. Due to the difficulty of gaining real datasets, in this paper we present a tool called MWGen that creates the overall space for moving objects, composed of the following environments: road network, bus network, metro network, pavement areas and indoor. Based on roads, all outdoor environments are created. The indoor environment consisting of a set of buildings is established from public floor plans. Moving objects are generated based on trip planning where a navigation algorithm through different environments is developed. We are able to produce moving objects integrated with multiple transportation modes. In addition, trip planning in a single environment is also available, e.g., shortest path for pedestrians, indoor navigation. The generated data, including all infrastructures and moving objects, are managed by GMOD. We conduct an extensive performance study to evaluate MWGen on two real road datasets and a set of public floor plans.