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GEOSTATS: Kriging with zonal anisotropy

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  • Jeffrey G. White
    One approach you might consider is that of sensitivity analysis, i.e., you krige several times using each of your variogram models to determine how much
    Message 1 of 1 , Jul 17, 1997
      One approach you might consider is that of "sensitivity" analysis, i.e.,
      you krige several times using each of your variogram models to determine
      how much effect their differences (in your case, only the sills)
      actually have on the output. We did this for directional and
      omni-directional variograms modeled over the continental US, and the
      results were not very different, indicating that while there was
      significant anisotropy, it had little effect on kriging outcome (White,
      J.G., R.M. Welch, W.A. Norvell. 1997. Soil zinc map of the USA using
      geostatistics and geographic information systems. Soil Sci. Soc. Amer.
      J. 61:185-194). Remember that kriging is a "moving average"
      interpolater, and, in most cases, relatively few neigboring points
      usually determine a kriged estimate. Given the similarity in your
      variograms, I suspect that kriging outcomes from them might be very
      similar.



      --
      Jeffrey G. White, Ph.D.
      Asst. Agronomist
      MAFES/Pontotoc Experiment Station
      8320 Hwy 15 South
      Pontotoc, MS 38863

      Tel: 601-489-4621; FAX: 601-489-6011
      email: jgwhite@...
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