Generating node coordinates for shortest-path computations in transportation networks

  • Authors:
  • Ulrik Brandes;Frank Schulz;Dorothea Wagner;Thomas Willhalm

  • Affiliations:
  • University of Konstanz, Konstanz, Germany;University of Karlsruhe, Karlsruhe, Germany;University of Karlsruhe, Karlsruhe, Germany;University of Karlsruhe, Karlsruhe, Germany

  • Venue:
  • Journal of Experimental Algorithmics (JEA)
  • Year:
  • 2004

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Abstract

Speed-up techniques that exploit given node coordinates have proven useful for shortest-path computations in transportation networks and geographic information systems. To facilitate the use of such techniques when coordinates are missing from some, or even all, of the nodes in a network we generate artificial coordinates using methods from graph drawing. Experiments on a large set of German train timetables indicate that the speed-up achieved with coordinates from our drawings is close to that achieved with the true coordinates---and in some special cases even better.