Improved local algorithms for spanner construction

  • Authors:
  • Iyad A. Kanj;Ge Xia

  • Affiliations:
  • School of Computing, DePaul University, Chicago, IL;Department of Computer Science, Acopian Engineering Center, Lafayette College, Easton, PA

  • Venue:
  • ALGOSENSORS'10 Proceedings of the 6th international conference on Algorithms for sensor systems, wireless adhoc networks, and autonomous mobile entities
  • Year:
  • 2010

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Abstract

Let S be a set of n points in the plane, let ε be the complete Euclidean graph whose point-set is S, and let G be the Delaunay triangulation of S. We present a very simple local algorithm that, given G, constructs a subgraph of G of degree at most 11 that is a geometric spanner of G with stretch factor 2.86, and hence a geometric spanner of ε with stretch factor O(n lg n) time centralized algorithm for constructing a subgraph of G that is a geometric spanner of ε of degree at most 11 and stretch factor The algorithm can be generalized to unit disk graphs to give a local algorithm for constructing a plane spanner of a unit disk graph of degree at most 11 and stretch factor