Encyclopedia of Algorithms

2016 Edition
| Editors: Ming-Yang Kao

Hub Labeling (2-Hop Labeling)

  • Daniel DellingEmail author
  • Andrew V. Goldberg
  • Renato F. Werneck
Reference work entry
DOI: https://doi.org/10.1007/978-1-4939-2864-4_580

Years and Authors of Summarized Original Work

  • 2003; Cohen, Halperin, Kaplan, Zwick

  • 2012; Abraham, Delling, Goldberg, Werneck

  • 2013; Akiba, Iwata, Yoshida

  • 2014; Delling, Goldberg, Pajor, Werneck

  • 2014; Delling, Goldberg, Savchenko, Werneck

Problem Definition

Given a directed graph G = (V, A) (with n =| V | and m =| A | ) with a length function : AR+ and a pair of vertices s, t, a distance oracle returns the distance dist(s, t) from s to t. A labeling algorithm [18] implements distance oracles in two stages. The preprocessing stage computes a label for each vertex of the input graph. Then, given s and t, the query stage computes dist(s, t) using only the labels of s and t; the query does not explicitly use G and .

Hub labeling (HL) (or 2-hop labeling) is a special kind of labeling algorithm. The label L( v) of a vertex v consists of two parts: the forward label L f( v) is a collection of vertices w with their distances dist( v, w) from v, while the backward label L b( v) is a collection...


Distance oracles Labeling algorithms Shortest paths 
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Recommended Reading

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    Abraham I, Delling D, Goldberg AV, Werneck RF (2011) A hub-based labeling algorithm for shortest paths on road networks. In: Proceedings of the 10th international symposium on experimental algorithms (SEA’11), Chania. Volume 6630 of Lecture notes in computer science. Springer, pp 230–241Google Scholar
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    Abraham I, Delling D, Fiat A, Goldberg AV, Werneck RF (2012) HLDB: location-based services in databases. In: Proceedings of the 20th ACM SIGSPATIAL international symposium on advances in geographic information systems (GIS’12), Redondo Beach. ACM, pp 339–348Google Scholar
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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Daniel Delling
    • 1
    Email author
  • Andrew V. Goldberg
    • 2
  • Renato F. Werneck
    • 3
  1. 1.MicrosoftSilicon ValleyUSA
  2. 2.Microsoft Research – Silicon ValleyMountain ViewUSA
  3. 3.Microsoft Research Silicon ValleyLa AvenidaUSA