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Re: AI-GEOSTATS: OSSFIM

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  • Edzer J. Pebesma
    Valquiria, OSSFIM calculates block kriging prediction errors as a function of data grid spacing, block size, and variogram model Any block kriging program can
    Message 1 of 2 , Feb 17, 2003
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      Valquiria,

      OSSFIM calculates block kriging prediction errors as a function of data grid
      spacing, block size, and variogram model

      Any block kriging program can do this for you, but OSSFIM tries to do it in
      an organized way, varying (IIRC) block size and data grid spacing given
      a variogram model. To do this with e.g. GSLIB or (plain) gstat would be a bit
      of an effort.

      I wrote the web interface to OSSFIM, http://www.gstat.org/ossfim.html a few
      years back. It is not based on the OSSFIM fortran code,but uses gstat. The
      page also tells you:

      Differences from the original OSSFIM version
      --------------------------------------------
      The original OSSFIM program by McBratney and Webster has more options than this
      web-version:
      it can handle triangular grids, it can handle the case where the block is
      centered around a sample point, and it deals with variograms with anisotropy.
      Gstat can
      calculate block kriging standard errors in all these cases, but not through
      this
      html-interface.

      You can run it as a stand alone program using

      gstat -e ossfim [arguments]

      the arguments are not documented, you have to run a few html versions
      (http://www.gstat.org/ossfim_form.html ) to see how it works.

      Any responses are welcome.
      --
      Edzer

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