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COMPGEOM
2009
ACM

Visibility maps of realistic terrains have linear smoothed complexity

14 years 3 months ago
Visibility maps of realistic terrains have linear smoothed complexity
We study the complexity of the visibility map of terrains whose triangles are fat, not too steep and have roughly the same size. It is known that the complexity of the visibility map of such a terrain with n triangles is Θ(n2 ) in the worst case. We prove that if the elevations of the vertices of the terrain are subject to uniform noise which is proportional to the edge lengths, then the worst-case expected (smoothed) complexity is only Θ(n). This provides an explanation why visibility maps of superlinear complexity are unlikely to be encountered in practice. Categories and Subject Descriptors F.2.2 [Analysis of Algorithms and problem complexity]: Nonnumerical Algorithms and Problems—Geometrical Problems and Computations General Terms Algorithms, Theory Keywords Terrains, Smoothed Analysis, Realistic Input, Visibility Maps
Mark de Berg, Herman J. Haverkort, Constantinos P.
Added 22 Jul 2010
Updated 22 Jul 2010
Type Conference
Year 2009
Where COMPGEOM
Authors Mark de Berg, Herman J. Haverkort, Constantinos P. Tsirogiannis
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