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Re: problem with TRIANGULATION option in CONTOUR [message #73048]

Sat, 23 October 2010 16:15

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Ben Tupper writes:

> You might consider running the points through GRID_INPUT first. I
> really have no idea if that will help in this case, but it often comes
> to the rescue when interpolating.

Yes, that's a good suggestion.

Or, I would try just gridding the data with Triangulate
and Trigrid, and pass the gridded data to Contour.
In other words, don't try to use the TRIANGULATION
keyword. (I have to admit, I had never heard of this
keyword!)

Here are the commands I use to grid irregular data
from a book that will be hot of the press in a month
or so. I get the X and Y vectors that go with the
gridded data from the XGRID and YGRID output
keywords to TriGrid.

Triangulate, lonIrr, latIrr, triangles
gridData = Trigrid(lonIrr, latIrr, dataIrr, $
triangles, NX=41, NY=41, $
XGrid=xgrid, YGrid=ygrid)
Contour, gridData, xgrid, ygrid, /Cell_Fill, $
Levels=levels, Background=FSC_Color('white'),$
Position=[0.125, 0.125, 0.95, 0.80], $
Color=FSC_Color('black'), XStyle=1, YStyle=1, $
C_Colors=Indgen(nlevels)+1

Cheers,

David

P.S. If you want to send the data, I'm always looking
for perverse examples to add to the book! :-)

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

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[Message index]

		Re: problem with TRIANGULATION option in CONTOUR By: David Fanning on Sat, 23 October 2010 16:15
		Re: problem with TRIANGULATION option in CONTOUR By: ben.bighair on Sat, 23 October 2010 15:52
		Re: problem with TRIANGULATION option in CONTOUR By: Ardhuin on Sat, 23 October 2010 15:00
		Re: problem with TRIANGULATION option in CONTOUR By: David Fanning on Sat, 23 October 2010 05:57
		Re: problem with TRIANGULATION option in CONTOUR By: Ardhuin on Mon, 25 October 2010 12:06

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