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[ai-geostats] interpolating along lines and .... THANK YOU!

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  • Monica Palaseanu-Lovejoy
    Hi list, First I would like to thank to the people answering my question about which interpolation method / model is better when I am using only deterministic
    Message 1 of 2 , Jan 4, 2006
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      Hi list,

      First I would like to thank to the people answering my question about which
      interpolation method / model is better when I am using only deterministic
      methods and I have a lack of data. Obviously it is not a clear answer ....
      so i will try to get more data or .... figure something else ;-)))

      So .... figuring something else made me to think about interpolating along
      lines / canals.

      I have a network of canals and few water stations along them. Knowing that
      the flow gradient along canals is very small and water levels are varying
      very smoothly, how can I interpolate along canals at set distances, for
      example? I guess i need a very simple algorithm like at mid distance in
      between 2 stations i will have the average values of those 2 stations, and
      so on. I wonder if you know about any software to do this automatically.

      Thank you for your assistance once more,

      Monica

      Monica Palaseanu-Lovejoy
      University of Florida

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    • Rühaak, Wolfram
      Hi Monica, ... What about a spline interpolation? Look for instance at http://www.csit.fsu.edu/~burkardt/cpp_src/spline/spline.html There is also a matlab
      Message 2 of 2 , Jan 5, 2006
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        Hi Monica,

        > -----Original Message-----
        > From: Monica Palaseanu-Lovejoy [mailto:mpal_lovejoy@...]
        > Hi list,
        > [...]
        > I have a network of canals and few water stations along them.
        > Knowing that
        > the flow gradient along canals is very small and water levels
        > are varying
        > very smoothly, how can I interpolate along canals at set
        > distances, for
        > example? I guess i need a very simple algorithm like at mid
        > distance in
        > between 2 stations i will have the average values of those 2
        > stations, and
        > so on. I wonder if you know about any software to do this
        > automatically.
        >
        > Thank you for your assistance once more,
        >
        > Monica
        > [...]

        What about a spline interpolation?

        Look for instance at http://www.csit.fsu.edu/~burkardt/cpp_src/spline/spline.html

        There is also a matlab version.

        However, splines are sometimes hard to use for extrapolation purposes.

        A simple inverse distance weighting method could also be used.

        I think the most difficult part is the fusion and segregation within a network of canals?

        Isn't there specialised software available (do you know http://www.dhisoftware.com).

        HTH, cheers Wolfram
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