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Contraction of Timetable Networks with Realistic Transfers

Geisberger, Robert

Abstract:
We contribute a fast routing algorithm for timetable networks with realistic transfer times. In this setting, our algorithm is the first one that successfully applies precomputation based on node contraction: gradually removing nodes from the graph and adding shortcuts to preserve shortest paths. This reduces query times to 0.5 ms with preprocessing times below 4 minutes on all tested instances, even on continental networks with 30 000 stations. 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. Also, our graph model does not require parallel edges.



Originalveröffentlichung
DOI: 10.1007/978-3-642-13193-6_7
Scopus
Zitationen: 24
Zugehörige Institution(en) am KIT Institut für Theoretische Informatik (ITI)
Publikationstyp Proceedingsbeitrag
Jahr 2010
Sprache Englisch
Identifikator ISBN: 978-3-642-13193-6
ISSN: 0302-9743, 1611-3349
KITopen-ID: 1000097653
Erschienen in Experimental Algorithms. Ed.: P. Festa
Verlag Springer, Berlin
Seiten 71-82
Serie Lecture Notes in Computer Science ; 6049
Nachgewiesen in Scopus
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