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Re: AI-GEOSTATS: variogram modeling with nested structures

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  • Marco Alfaro
    Dear Lorenz: You cannot use the power model in the case of indicator variograms. The variogram g(h) of a random set (indicator 0 or 1) has the following
    Message 1 of 3 , Feb 16, 2001
      Dear Lorenz:

      You cannot use the power model in the case of indicator variograms.

      The variogram g(h) of a random set (indicator 0 or 1) has the following relationships (not accomplished by the power variogram):

      g(h) <= 0.5
      g(2h) <= 2g(h)

      Regards,

      Marco



      "Dobler, Lorenz" wrote:

      > Hello list,
      >
      > I am dealing with heavy metals in upper soil layers of forests. Some
      > of my (indicator) variograms behave like a spherical model at the
      > beginning but in stead of reaching the sill they behave like a
      > power-model for greater distances. I tried
      > several power models but they didn't fit the variogram very well.
      > Just two questions:
      >
      > 1. What does this special behavior of the experimental variogram tell
      > me about the spatial structure or stationarity?
      > 2. Can I „mix" a spherical and and a power model to build up one
      > nested model?
      >
      > Hope somebody can help
      > Bye
      > Lenz
      >
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