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AI-GEOSTATS: Information about Kriging 3D and semivariogram in 3D

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  • lisa pizzol
    Hello to everybody, I have to build a semivariogram in 3D and I need to know if I can use the same concepts used for the 2D semivariogram or if the theory is
    Message 1 of 3 , Nov 6, 2003
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      Hello to everybody,



      I have to build a semivariogram in 3D and I need to know if I can use the same concepts used for the 2D semivariogram or if the theory is different. For example how can I consider the distance? In one article they said that I can first build the semivariogram in the horizontal direction in order to find the values of sill, range, nugget and the equation of the semivariogram. After this I can use these information to find the range in the vertical direction. Do you know any references that explain exactly how to do it?

      Thank you very much.


      Lisa



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    • Isobel Clark
      Lisa Distances and directions in 3d can be calculated very simply just as in 2d. There is shareware (Geostat Toolbox) and other software out there for 3d.
      Message 2 of 3 , Nov 6, 2003
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        Lisa

        Distances and directions in 3d can be calculated very
        simply just as in 2d. There is shareware (Geostat
        Toolbox) and other software out there for 3d.

        Calculating semi-variograms whilst pretending your
        data is two dimensional can lead to extremely
        misleading semi-variograms. In particular your nugget
        effect will be exaggerated out of all proportion to
        reality.

        At the risk of offending some of our more sensitive
        list members, can I suggest you try things out on our
        FREE teaching software PG2000 which includes 3d
        capabilities. Test data set for this is a copper dump,
        which is provided in the FREE downloadable data sets.
        Find all this and other free goodies at
        http://geoecosse.bizland.com/softwares

        Isobel Clark

        --- lisa pizzol <lisa_pizzol@...> wrote: >
        > Hello to everybody,
        >
        >
        >
        > I have to build a semivariogram in 3D
        > and I need to know if I can use the same concepts
        > used for the 2D semivariogram or if the theory is
        > different. For example how can I consider the
        > distance? In one article they said that I can first
        > build the semivariogram in the horizontal direction
        > in order to find the values of sill, range, nugget
        > and the equation of the semivariogram. After this I
        > can use these information to find the range in the
        > vertical direction. Do you know any references that
        > explain exactly how to do it?
        >
        > Thank you very much.
        >
        >
        > Lisa
        >
        >
        >
        > ---------------------------------
        > Yahoo! Mail: 6MB di spazio gratuito, 30MB per i tuoi
        > allegati, l'antivirus, il filtro Anti-spam

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      • Pierre Goovaerts
        Hi Lisa, I would recommend that you look at Chapter 16 of Isaaks and Srivastava s book An introduction to Applied Geostatistics which offers a very nice
        Message 3 of 3 , Nov 8, 2003
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          Hi Lisa,

          I would recommend that you look at Chapter 16 of Isaaks and Srivastava's
          book "An introduction to Applied Geostatistics" which offers a very nice
          description of how to model semivariograms in different directions and
          up to 3 dimensions. You can also refer to the following paper:
          Barabas, N., Goovaerts, P. and P. Adriaens. 2001. Geostatistical
          assessment and validation of uncertainty for three-dimensional dioxin data
          from sediments in an estuarine river. Environmental Science & Technology,
          35(16): 3294-3301.

          Best regards,

          Pierre Goovaerts

          <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

          Dr. Pierre Goovaerts
          President of PGeostat, LLC
          Chief Scientist with Biomedware Inc.
          710 Ridgemont Lane
          Ann Arbor, Michigan, 48103-1535, U.S.A.

          E-mail: goovaert@...
          Phone: (734) 668-9900
          Fax: (734) 668-7788
          http://alumni.engin.umich.edu/~goovaert/

          <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

          On Thu, 6 Nov 2003, [iso-8859-1] lisa pizzol wrote:

          >
          > Hello to everybody,
          >
          >
          >
          > I have to build a semivariogram in 3D and I need to know if I can use the same concepts used for the 2D semivariogram or if the theory is different. For example how can I consider the distance? In one article they said that I can first build the semivariogram in the horizontal direction in order to find the values of sill, range, nugget and the equation of the semivariogram. After this I can use these information to find the range in the vertical direction. Do you know any references that explain exactly how to do it?
          >
          > Thank you very much.
          >
          >
          > Lisa
          >
          >
          >
          > ---------------------------------
          > Yahoo! Mail: 6MB di spazio gratuito, 30MB per i tuoi allegati, l'antivirus, il filtro Anti-spam


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