[SciPy-user] problem using interp2d

Christian Kristukat ckkart at hoc.net
Thu Aug 25 08:22:34 CDT 2005

Robert Kern wrote:
> Christian Kristukat wrote:
>>I tried to get 2d interpolation to work without success some month ago
>>and finally I found an alternative. CDAT (http://esg.llnl.gov/cdat/) has
>>a standalone python module for 2d interpolation called natgrid. It works
>>like a charm. You can feed in a cloud of points and you get back
>>interpolated data on a rectangular grid.
>>It would be very nice to have this included in scipy.
> Unfortunately, we cannot use natgrid directly since it is GPLed (it
> comes from NCAR Graphics).
>   http://ngwww.ucar.edu/ng4.4/
> Hmm, CDAT as a whole seems to prohibit commercial use. Naughty of them.
> The website of the original author of natural-neighbor interpolation
> algorithm, Dave Watson, does not appear to be online at the moment.
> If someone wants to code the algorithm using the available literature,
> we'd be more than happy to include it.

I found Dave Watson's code on the webpage of the "International Association for 
Mathematical Geology"


It doesn't say anything about copyright. Does that mean it is free to use/spread?

Regards, Christian

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