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arXiv · 0908.1528

Contraction of Timetable Networks with Realistic Transfers

Robert Geisberger
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Abstract

We successfully contract timetable networks with realistic transfer times. Contraction gradually removes nodes from the graph and adds shortcuts to preserve shortest paths. This reduces query times to 1 ms with preprocessing times around 6 minutes on all tested instances. We achieve this by an improved contraction algorithm and by using a station graph model. Every node in our graph has a one-to-one correspondence to a station and every edge has an assigned collection of connections. Our graph model does not need parallel edges. The query algorithm does not compute a single earliest arrival time at a station but a set of arriving connections that allow best transfer opportunities.

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Robert Geisberger. 2009-08-12. Contraction of Timetable Networks with Realistic Transfers. https://arxiv.org/abs/0908.1528

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