Multivariate interpolation of large sets of scattered data

  • Authors:
  • Robert J. Renka

  • Affiliations:
  • Univ. of North Texas, Denton

  • Venue:
  • ACM Transactions on Mathematical Software (TOMS)
  • Year:
  • 1988

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Abstract

This paper presents a method of constructing a smooth function of two or more variables that interpolates data values at arbitrarily distributed points. Shepard's method for fitting a surface to data values at scattered points in the plane has the advantages of a small storage requirement and an easy generalization to more than two independent variables, but suffers from low accuracy and a high computational cost relative to some alternative methods. Localizations of this method have reasonably low computational costs, but remain relatively inaccurate. We describe a modified Shepard's method that, without sacrificing the advantages, has accuracy comparable to other local methods. Computational efficiency is also improved by using a cell method for nearest-neighbor searching. Test results for two and three independent variables are presented.