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AI-GEOSTATS: Sill in the Rational Quadratic Semivariogram Model

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  • Yadollah Waghei
    Hello, AI_Geostats members In some model for variograms the Range (the distance at which dependency is disappear) is differ from the Range parameter in the
    Message 1 of 1 , Jun 24, 2001
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      Hello, AI_Geostats members
      In some model for variograms the Range (the distance at which dependency is disappear) is differ from the Range parameter in the model. For example in the exponential semivariogram model (bellow)
      range = 3 * (range parameter)
      (reference: the user manual of GS+ software)
      My question is that what is the relationship between range and range parameter in Rational Quadratic Semivariogram Model? Cressie,1993 (page 61) has written the model as:

      g(h) = c0 + cr*(h^2)/(1 + h^2/ar)

      where cr and ar are the sill parameter and range parameter.
      Thank you for your attention.
      Yadollah Waghei
      Dep.of Biostatistics
      Tarbiat Modarres Univ.(Tehran)Po.Box: 14115-111
      Tel:8011001-3872 Fax:8007989
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