GEOSTATS: Kriging with zonal anisotropy
- 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
Jeffrey G. White, Ph.D.
MAFES/Pontotoc Experiment Station
8320 Hwy 15 South
Pontotoc, MS 38863
Tel: 601-489-4621; FAX: 601-489-6011
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