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Re: AI-GEOSTATS: Kriging colour

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  • Isobel Clark
    Benjamin Just a thought. Since your actual colour is a combination of the three primary colours, could you perhaps do a principal components analysis on the
    Message 1 of 4 , Apr 24 10:11 AM
      Benjamin

      Just a thought. Since your actual colour is a
      combination of the three primary colours, could you
      perhaps do a principal components analysis on the
      three 0-255 colour levels?

      This would have two effects:

      (1) would give you variables which expressed the
      'combined' colour

      (2) would highlight the different 'populations' of
      soil with markedly different colour characteristics.

      We have used a similar approach to distinguish between
      limestone types in quarries and for 'brightness' of
      china clays.

      Isobel Clark

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    • Laura Kracker
      Yes, in fact, check out this work by William Hargrove at Oak Ridge. It is a very effective way to visualize color data weighted by PCA results. His paper on
      Message 2 of 4 , Apr 24 10:36 AM
        Yes, in fact, check out this work by William Hargrove at Oak Ridge. It
        is a very effective way to visualize color data weighted by PCA results.

        His paper on clustering of ecoregions:
        http://www.esri.com/library/userconf/proc97/proc97/to250/pap226/p226.htm

        His home page:
        http://research.esd.ornl.gov/~hnw/

        Laura Kracker

        Isobel Clark wrote:
        >
        > Benjamin
        >
        > Just a thought. Since your actual colour is a
        > combination of the three primary colours, could you
        > perhaps do a principal components analysis on the
        > three 0-255 colour levels?
        >
        > This would have two effects:
        >
        > (1) would give you variables which expressed the
        > 'combined' colour
        >
        > (2) would highlight the different 'populations' of
        > soil with markedly different colour characteristics.
        >
        > We have used a similar approach to distinguish between
        > limestone types in quarries and for 'brightness' of
        > china clays.
        >
        > Isobel Clark
        >
        > ____________________________________________________________
        > Do You Yahoo!?
        > Get your free @... address at http://mail.yahoo.co.uk
        > or your free @... address at http://mail.yahoo.ie
        >
        > --
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        --
        Laura M. Kracker, Phd.
        Research Scientist/GIS Specialist
        JHT contractor to:
        Center for Coastal Environmental Health
        and Biomolecular Research (CCEHBR)
        NOAA/National Ocean Service
        219 Fort Johnson Road
        Charleston, SC 29412-9100
        Phone: 843-762-8640
        Fax: 843-762-8700
        e-mail: laura.kracker@...
        http://www.chbr.noaa.gov
        ---------------------------------------------

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