Chapter

Algorithms – ESA 2005

Volume 3669 of the series Lecture Notes in Computer Science pp 355-366

I/O-Efficient Construction of Constrained Delaunay Triangulations

  • Pankaj K. AgarwalAffiliated withDepartment of Computer Science, Duke University
  • , Lars ArgeAffiliated withDepartment of Computer Science, Duke UniversityDepartment of Computer Science, University of Aarhus
  • , Ke YiAffiliated withDepartment of Computer Science, Duke University

Abstract

In this paper, we designed and implemented an I/O-efficient algorithm for constructing constrained Delaunay triangulations. If the number of constraining segments is smaller than the memory size, our algorithm runs in expected \(O(\frac{N}{B}{\rm log}_{M/B}\frac{N}{B})\) I/Os for triangulating N points in the plane, where M is the memory size and B is the disk block size. If there are more constraining segments, the theoretical bound does not hold, but in practice the performance of our algorithm degrades gracefully. Through an extensive set of experiments with both synthetic and real data, we show that our algorithm is significantly faster than existing implementations.