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

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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
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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• 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
> [...]

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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