Multi cover of a polygon minimizing the sum of areas

A. Karim Abu-Affash, Paz Carmi, Matthew J. Katz, Gila Morgenstern

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We consider a geometric optimization problem that arises in sensor network design. Given a polygon P (possibly with holes) with n vertices, a set Y of m points representing sensors, and an integer k, 1 ≤ k ≤ m. The goal is to assign a sensing range, r i, to each of the sensors y i ∈ Y, such that each point p ∈ P is covered by at least k sensors, and the cost, ∑ i,r i α, of the assignment is minimized, where α is a constant. In this paper, we assume that α = 2, that is, find a set of disks centered at points of Y, such that (i) each point in P is covered by at least k disks, and (ii) the sum of the areas of the disks is minimized. We present, for any constant k < 1, a polynomial-time c 1-approximation algorithm for this problem, where c 1 = c 1(k) is a constant. The discrete version, where one has to cover a given set of n points, X, by disks centered at points of Y, arises as a subproblem. We present a polynomial-time c 2-approximation algorithm for this problem, where c 2 = c 2(k) is a constant.

Original languageEnglish
Pages (from-to)685-698
Number of pages14
JournalInternational Journal of Computational Geometry and Applications
Volume21
Issue number6
DOIs
StatePublished - 1 Dec 2011

Keywords

  • Disk-cover
  • approximation algorithms

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