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Re: Satellite projection contour plots [message #75575]

Thu, 31 March 2011 12:08

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Matt writes:

> Thanks David, I think you're right about the math at high latitude.
> The problem appears to be less severe if the poles are not visible.
> I'd be interested to hear what they say at the D.C. seminar.

I was playing around with contour plots on map projections
a little bit this morning. In my case, I had random X,Y,Z
data that had to be gridded before display. This could NOT
be done properly from the contour command. Instead, I had
to use Triangulate and Trigrid themselves, so I had more
control over the parameter space.

Oddly enough, I got *completely* different results if
I used spherical gridding compared to just normal gridding.
I didn't know what to make of this, since I am not at
all familiar with the data I was given. But, I do note
that you MUST use CELL_FILL with the contour plot, rather
than FILL or you get *exceedingly* strange results.

And even when I got "nice" results, it appeared that the
contours did not match at the date line. They appeared to
be one contour level off as they came together.
I don't know what to make of that, either.

So, I am interested in the D.C. seminar, too. I'll take
my data with me. :-)

Cheers,

David

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

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[Message index]

		Re: Satellite projection contour plots By: David Fanning on Thu, 31 March 2011 12:08
		Re: Satellite projection contour plots By: Matt[3] on Thu, 31 March 2011 11:56
		Re: Satellite projection contour plots By: David Fanning on Wed, 30 March 2011 09:37
		Re: Satellite projection contour plots By: Matt[3] on Mon, 04 April 2011 16:29

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