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Journal Articles Journal of Computational Geometry Year : 2016

The worst visibility walk in a random Delaunay triangulation is $O(\sqrt{n})$

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Ross Hemsley
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Abstract

We show that the memoryless routing algorithms Greedy Walk, Compass Walk, and all variants of visibility walk based on orientation predicates are asymptotically optimal in the average case on the Delaunay triangulation. More specifically, we consider the Delaunay triangulation of an unbounded Poisson point process of unit rate and demonstrate that, for any pair of vertices (s, t) inside a square of area n, the ratio between the longest and shortest visibility walks between s and t is bounded by a constant with probability converging to one (as long as the vertices are sufficiently far apart). As a corollary, it follows that the worst-case path has $O(\sqrt{n})$ steps in the limiting case, under the same conditions. Our results have applications in routing in mobile networks and also settle a long-standing conjecture in point location using walking algorithms. Our proofs use techniques from percolation theory and stochastic geometry.
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Dates and versions

hal-01348831 , version 1 (25-07-2016)

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Olivier Devillers, Ross Hemsley. The worst visibility walk in a random Delaunay triangulation is $O(\sqrt{n})$ . Journal of Computational Geometry, 2016, 7 (1), pp.332-359. ⟨10.20382/jocg.v7i1a16⟩. ⟨hal-01348831⟩
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