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Arrangements of Geodesic Arcs on the Sphere

world-voronoi overlay
The overlay of: 1. an arrangement on the sphere  induced by
the continents and some of the islands on earth rendered in
blue, and 2.  the Voronoi diagram the cities that hosts the
institutions that participate in the ACS (Algorithms for
Complex Shapes) project rendered in red.


Recently, the Arrangement_2 package of CGAL, the Computational Geometry Algorithms Library, has been greatly extended to support arrangements of curves embedded on two-dimensional parametric surfaces. The general framework for sweeping a set of curves embedded on a two-dimensional parametric surface was introduced in[*]. In this project we concentrate on the specific algorithms and implementation details involved in the exact construction and maintenance of arrangements induced by arcs of great circles embedded on the sphere, also known as geodesic arcs, and on the exact computation of Voronoi diagrams on the sphere, the bisectors of which are geodesic arcs. This class of Voronoi diagrams includes the subclass of Voronoi diagrams of points and its generalization, power diagrams, also known as Laguerre Voronoi diagrams. The resulting diagrams are represented as arrangements, and can be passed as input to consecutive operations supported by the Arrangement_2 package and its derivatives. The implementation is complete in the sense that it handles degenerate input, and it produces exact results. An example that uses real world data is included.

Additional material is available at:



poster thumb


Additional information


  • Efi Fogel, Ophir Setter and Dan Halperin
    Exact Implementation of Arrangements of Geodesic Arcs on the Sphere with  Applications

    In Abstracts of 24th European Workshop on Computational Geometry (EWCG), pages 83-86, 2008 [pdf] [bibtex]

  • Efi Fogel, Ophir Setter and Dan Halperin
    Arrangements of Geodesic arcs on the Sphere
    In Proceedings of the 24th ACM Annual Symposium on Computational Geometry (SoCG), pages 218-219, 2008 [movie - additional information] [link] [bibtex]
  • Eric Berberich, Efi Fogel, Dan Halperin, Kurt Mehlhorn, and Ron Wein
    Sweeping and Maintaining Two-Dimensional Arrangements on Surfaces: A First Step
    In Proceedings 15th Annual European Symposium on Algorithms (ESA), pages 645–656, 2007 [project site] [link] [bibtex]


Efi Fogel
Ophir Setter
Dan Halperin
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