Line facility location in weighted regions
Journal of Combinatorial Optimization
A survey of geodesic paths on 3D surfaces
Computational Geometry: Theory and Applications
Approximate distance queries for weighted polyhedral surfaces
ESA'11 Proceedings of the 19th European conference on Algorithms
Fast query structures in anisotropic media
Theoretical Computer Science
Approximating geodesic distances on 2-manifolds in R3
Computational Geometry: Theory and Applications
Similarity of polygonal curves in the presence of outliers
Computational Geometry: Theory and Applications
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We consider the well-known geometric problem of determining shortest paths between pairs of points on a polyhedral surface P, where P consists of triangular faces with positive weights assigned to them. The cost of a path in P is defined to be the weighted sum of Euclidean lengths of the sub-paths within each face of P. We present query algorithms that compute approximate distances and/or approximate shortest paths on P. Our all-pairs query algorithms take as input an approximation parameter ε∈(0,1) and a query time parameter $\mathfrak{q}$, in a certain range, and build a data structure $\mathrm{APQ}(P,\varepsilon;\mathfrak{q})$, which is then used for answering ε-approximate distance queries in $O(\mathfrak{q})$time. As a building block of the $\mathrm{APQ}(P,\varepsilon;\mathfrak{q})$data structure, we develop a single-source query data structure SSQ(a;P,ε) that can answer ε-approximate distance queries from a fixed point a to any query point on P in logarithmic time. Our algorithms answer shortest path queries in weighted surfaces, which is an important extension, both theoretically and practically, to the extensively studied Euclidean distance case. In addition, our algorithms improve upon previously known query algorithms for shortest paths on surfaces. The algorithms are based on a novel graph separator algorithm introduced and analyzed here, which extends and generalizes previously known separator algorithms.