A proposal for a formal model of objects
Object-oriented concepts, databases, and applications
Designing Flexible Object-Oriented Systems with UML
Designing Flexible Object-Oriented Systems with UML
Graph Algorithms
A Theory of Objects
Object-Oriented Design for Temporal GIS
Object-Oriented Design for Temporal GIS
A Spatiotemporal Model and Language for Moving Objects on Road Networks
SSTD '01 Proceedings of the 7th International Symposium on Advances in Spatial and Temporal Databases
Towards Temporal Dynamic Segmentation
Geoinformatica
Exploiting the semantics of location granules in location-dependent queries
ADBIS'10 Proceedings of the 14th east European conference on Advances in databases and information systems
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A transit network is a spatiotemporally dynamic system whose topology, components, and services all change over time. The complexity and dynamic nature of transit networks make it difficult to model by traditional transportation models. This paper presents an object-oriented data model that coherently represents space, time, and dynamics of transit networks and supports schedule-based pathfinding. In this data model, a transit network and its components are modelled as spatiotemporal objects that have properties and behaviours. Unlike traditional roadway transportation network models that define topology as connectivity between geometric elements such as edges and nodes, this data model uniquely defines topology as sequences and collections of transit features which are application domain objects. Moreover, this data model supports the generation of active network topologies based on given times to represent real-time network states as well as to reduce topological redundancy. Implementations of the data model in two Internet transit trip planners have demonstrated that it can effectively reduce computation complexity of schedule-based pathfinding algorithms and enhance pathfinding performance.