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Re: Fast Filled Contour Plots [message #79886 is a reply to message #79885]

Tue, 17 April 2012 15:18

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

On 17 avr, 21:33, David Fanning <n...@idlcoyote.com> wrote:
> As I was working on this, Chris Torrence graciously supplied
> some IDL 8.x code to do the same thing. I've included the
> code Chris sent me in the article. Unfortunately, it
> probably does more to expose the limitations of the new
> function graphics system than it does to illuminate the
> features. But, perhaps I have done something wrong. If
> anyone has suggestions (Alain?) for how I can fix this,
> I am all ears.

Your welcome, David.
The problem in Chris Torrence's code comes from the fact that the
longitude range in MAP_CONTINENTS is -180°,180° by default, while you
are using 0°,360° in your example. The trick would be to overplot a
suitable map over your image:
im = IMAGE(scaledData, x, y, RGB_TABLE=rgb, XRANGE=xrange,
YRANGE=yrange, GRID_UNITS='degrees', POSITION=[0.1,0.1,0.9,0.9])
mp = map('EQUIRECTANGULAR', LIMIT=limit, LABEL_POSITION=0,
POSITION=[0.1,0.1,0.9,0.9], /CURRENT)
mc = MapContinents(FILL_COLOR=!COLOR.DARK_GRAY, LIMIT=limit)
Everything is now correctly clipped and displayed, including the grid
overlay.
Note the use of FILL_COLOR instead of COLOR to get continents of the
right color.
There is no bug here, just tricky usage of partly (un)documented
keywords...
alx.

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[Message index]

		Re: Fast Filled Contour Plots By: David Fanning on Wed, 18 April 2012 05:30
		Re: Fast Filled Contour Plots By: David Fanning on Wed, 18 April 2012 05:24
		Re: Fast Filled Contour Plots By: lecacheux.alain on Wed, 18 April 2012 02:06
		Re: Fast Filled Contour Plots By: David Fanning on Tue, 17 April 2012 21:32
		Re: Fast Filled Contour Plots By: David Fanning on Tue, 17 April 2012 15:52
		Re: Fast Filled Contour Plots By: lecacheux.alain on Tue, 17 April 2012 15:18

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