Maintaining approximate extent measures of moving points

  • Authors:
  • Pankaj K. Agarwal;Sariel Hal-Peled

  • Affiliations:
  • Center for Geometric Computing, Department of Computer Science, Box 90129, Duke University, Durham, NC;Department of Computer Science, DCL 2111/ University of Illinois/ 1304 West Springfield Ave./ Urbana, IL

  • Venue:
  • SODA '01 Proceedings of the twelfth annual ACM-SIAM symposium on Discrete algorithms
  • Year:
  • 2001

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Abstract

We present approximation algorithms for maintaining various descriptors of the extent of moving points in Rd. We first describe a data structure for maintaining the smallest orthogonal rectangle containing the point set. We then use this data structure to maintain the approximate diameter, smallest enclosing disk, width, and smallest area or perimeter bounding rectangle of a set of moving points in R2 so that the number of events is only a constant. This contrasts with &OHgr;(n2) events that data structures for the maintenance of those exact properties have to handle.