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RE: AI-GEOSTATS: Variowin Maximal distance option

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  • Adrián Martínez Vargas
    In Variowin Help appear In order to reduce the size of the pair comparison file, and hence the memory requirements of PREVAR2D and VARIO2DP, a Pair
    Message 1 of 2 , Jan 23, 2002
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      In Variowin Help appear

      In order to reduce the size of the pair comparison file, and hence the
      memory requirements of PREVAR2D and VARIO2DP, a Pair Comparison File can be
      constructed from subsets of the available data :

      1) Subsets can be based on maximum difference in X and/or Y coordinates
      using the Settings | X and Y coordinates... menu item.
      2) Subsets can be based on acceptable ranges of variables values using
      the Settings | Limits... menu item.

      In practice it is the same to not include in the analysis the lag that are
      not in the range of maximum difference in X and/or Y.

      The formula maximum lag = sqr(dx^2 + dy^2) is to rigid, in practice the
      maximum lag depend of the objective of your work, some times the larges lag
      give you interesting information for understand the behavior of the data. If
      you pretend to utilize the variogram to estimate, refine shortest lags.

      King regards

      Adrian Martínez Vargas
      Ing. Geolólo (profesor)
      Istituto Superior Minero Metalúrgico (ISMM)
      Las Coloradas, s/n
      Reparto Caribe.
      Moa, Holguín, Cuba
      CP 83329
      E. Mail: amvargas@...




      -----Mensaje original-----
      De: Peter Bossew [mailto:p.bossew@...]
      Enviado el: martes, 22 de enero de 2002 8:33
      Para: ai-geostats@...
      Asunto: AI-GEOSTATS: Variowin Maximal distance option


      dear list,

      I have a question on Variowin software. The 'Prevar2D' module (which is
      used to create the pair files) has an option to select maximum differences
      dx and dy in the x- and y-coordinates in order to reduce the number of
      pairs (useful if there are too many data points, see Yves Pannatier's book
      page 26).
      I would expect that variograms calculated out of pair-files truncated this
      way should have a maximum lag = sqr(dx^2 + dy^2). But in fact the
      variograms go until the largest lag allowed by the range of the
      coordinates.

      But maybe I just did not understand the idea of the 'maximum distance'
      option ?? (The manual does not say anything further about it.)

      Thanks for advice !

      ----------------------------------------------------------------------------
      ---------
      Peter Bossew
      Institute of Physics and Biophysics, University of Salzburg, Austria

      home: Georg Sigl-Gasse 13/11, A-1090 Vienna, Austria
      ph. +43-1-3177627, e-mail: p.bossew@...


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