, Volume 38, Issue 4, pp 577–589

Computing a (1+ε)-Approximate Geometric Minimum-Diameter Spanning Tree


    • School of Computer Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1
    • Department of Computer Science, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5A9
    • Department of Computer Science, Duke University, Box 90129, Durham, NC 27708
    • Communication Systems Engineering Department, Ben-Gurion University of the Negev, Beer-Sheva, 84105
    • Department of Computer Science, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3175

DOI: 10.1007/s00453-003-1056-z

Cite this article as:
Spriggs, M., Keil, J., Bespamyatnikh, S. et al. Algorithmica (2004) 38: 577. doi:10.1007/s00453-003-1056-z


Given a set P of points in the plane, a geometric minimum-diameter spanning tree (GMDST) of P is a spanning tree of P such that the longest path through the tree is minimized. For several years, the best upper bound on the time to compute a GMDST was cubic with respect to the number of points in the input set. Recently, Timothy Chan introduced a subcubic time algorithm. In this paper we present an algorithm that generates a tree whose diameter is no more than (1 + ε) times that of a GMDST, for any ε > 0. Our algorithm reduces the problem to several grid-aligned versions of the problem and runs within time $O(ε-3+ n) and space O(n).

Minimum diameter spanning treeApproximation algorithmGeometric graph

Copyright information

© Springer-Verlag 2003