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Re: GridData Conundrum [message #70558 is a reply to message #70476]

Mon, 19 April 2010 11:52

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Klemen writes:

> Hi David, I have no problems with GRIDDATA; take a look at the code.
> The only problem I had was the triangulate function - you might have
> problems with collinear points on the poles if you don't remove
> them).

I've discovered a couple more interesting facts about
this process this morning. It turns out that it is
mostly Triangulate that is giving me problems. I've
found I do NOT have to exclude any values to produce
the proper triangulation, and that the "co-linear"
problem occurs on my Windows box, but not my Linux
box. On Windows, setting the TOLERANCE keyword to 1
appears to solve the problem.

Also interesting is that there is a small gap (mostly
camouflaged in my web article) where the longitude vector
wraps around from 257.5 to 0 degrees. This is especially
apparent in the filled contour method, and less apparent
in the NSIDC regrid method. It appears to disappear
completely in the GridData method, perhaps justifying
my confidence in its power, if we can just learn to
harness it. :-)

I'll update my web page article sometime soon. But
managing to do this with GridData opens up a path
I have been searching for for at least the last
two years!

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thos speakest truth.")

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[Message index]

		GridData Conundrum By: David Fanning on Sat, 17 April 2010 10:19
		Re: GridData Conundrum By: David Fanning on Mon, 19 April 2010 13:46
		Re: GridData Conundrum By: David Fanning on Wed, 21 April 2010 12:23
		Re: GridData Conundrum By: David Fanning on Mon, 19 April 2010 11:52
		Re: GridData Conundrum By: Klemen on Mon, 19 April 2010 07:44
		Re: GridData Conundrum By: David Fanning on Mon, 19 April 2010 07:03
		Re: GridData Conundrum By: David Fanning on Thu, 22 April 2010 06:07
		Re: GridData Conundrum By: ben.bighair on Thu, 22 April 2010 05:35

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