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A data model for trip planning in multimodal transportation systems

机译:多式联运系统中旅行计划的数据模型

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This paper introduces the problem of modeling urban transportation systems in a database where certain aspects of the data are probabilistic in nature. The transportation network is composed of multiple modes (e.g., automobile, bus, train, pedestrian) that the user can alternate between. A trip -- a path between an origin and destination subject to some constraints -- is the central concept. How these trips and the network can be represented as both a graph and relational model, as well as the requirements for querying are the main contributions of this paper. A set of operators are defined to work over these transportation concepts and they are integrated within a SQL-like syntax to express queries over the uncertain transportation network. Additionally, the paper shows how this model can be integrated within other moving objects and spatio-temporal data models, and how these graph-based queries can be processed.
机译:本文介绍了在数据库中对城市交通系统进行建模的问题,该数据库中某些方面的数据本质上是概率性的。运输网络由用户可以在其间交替的多种模式(例如,汽车,公共汽车,火车,行人)组成。行程-受到某些约束的起点和终点之间的路径-是中心概念。如何将这些行程和网络表示为图形和关系模型,以及查询的要求是本文的主要贡献。定义了一组运算符来处理这些运输概念,并将它们集成在类似SQL的语法中,以在不确定的运输网络上表达查询。此外,本文还介绍了如何将该模型集成到其他移动对象和时空数据模型中,以及如何处理这些基于图的查询。

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