Geometric Secluded Paths and Planar Satisfiability

Authors Kevin Buchin, Valentin Polishchuk, Leonid Sedov, Roman Voronov

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Author Details

Kevin Buchin
  • Department of Mathematics and Computer Science, TU Eindhoven, The Netherlands
Valentin Polishchuk
  • Communications and Transport Systems, ITN, Linköping University, Sweden
Leonid Sedov
  • Communications and Transport Systems, ITN, Linköping University, Sweden
Roman Voronov
  • Institute of Mathematics and Information Technologies, Petrozavodsk State University, Russia


We thank Mike Paterson for raising the question of finding minimum-exposure paths, and the anonymous reviewers for the comments improving the presentation of the paper; we also acknowledge discussions with Irina Kostitsyna, Joe Mitchell and Topi Talvitie. Part of the work was done at the workshop on Distributed Geometric Algorithms held in the University of Bologna Centre at Bertinoro Aug 25-31, 2019. VP and LS are supported by the Swedish Transport Administration and the Swedish Research Council.

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Kevin Buchin, Valentin Polishchuk, Leonid Sedov, and Roman Voronov. Geometric Secluded Paths and Planar Satisfiability. In 36th International Symposium on Computational Geometry (SoCG 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 164, pp. 24:1-24:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)


We consider paths with low exposure to a 2D polygonal domain, i.e., paths which are seen as little as possible; we differentiate between integral exposure (when we care about how long the path sees every point of the domain) and 0/1 exposure (just counting whether a point is seen by the path or not). For the integral exposure, we give a PTAS for finding the minimum-exposure path between two given points in the domain; for the 0/1 version, we prove that in a simple polygon the shortest path has the minimum exposure, while in domains with holes the problem becomes NP-hard. We also highlight connections of the problem to minimum satisfiability and settle hardness of variants of planar min- and max-SAT.

Subject Classification

ACM Subject Classification
  • Theory of computation
  • Theory of computation → Computational geometry
  • Visibility
  • Route planning
  • Security/privacy
  • Planar satisfiability


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