| Re: IDL 5.2.1 -- bug in filled contours? [message #17440] |
Wed, 27 October 1999 00:00  |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Bob Yantosca wrote:
> Hi all,
>
> I've noticed a potential bug in IDL 5.2.1 when you try to overplot filled
> contours atop a map. Basically, what happens is that you get a
> small square of color that covers a tiny square centered on Lat=0,
> Lon=0, instead of covering the entire map area.
>
> See below for a test program I've devised to illustrate the error. The
> first plot (with regular color contours) comes out fine. When you use the
> /FILL keyword then you run into this bug. (I tried /CELL_FILL too, but
> that didn't make any difference).
>
> Per Martin Schultz's suggestion, I tried resetting the Y-axis indices so
> that the poles were -89.9 and +89.9 (instead of -90 and +90), but on my
> system (SGI-IRIX), that didn't help at all.
>
> Any suggestions?
>
> Thanks much,
>
> Bob Yantosca
> bmy@io.harvard.edu
>
> ------------------------------------------------------------ ----------
> pro Test_Contour
> loadct, 27 ; EOS-B Colortable
> !P.MULTI = [0, 1, 2, 0, 0] ; 2 plots per page
> TmpData = Dist(72, 46) ; Test array for plot
> XArr = findgen(72)*5.0 - 180.0 ; X-indices
> YArr = findgen(46)*4.0 - 90.0 ; Y-indices
> C_Levels = findgen(10)*4 ; Contour levels
> C_Colors = findgen(10)*10 ; Contour colors
>
> ; Call MAP_SET and CONTOUR with unfilled color contours
> Map_Set, /Grid, /Continents, Color=2, $
> Title='IDL 5.2 Color Contours (OK)'
>
> Contour, TmpData, XArr, YArr, $
> Levels=C_Levels, C_Colors=C_Colors, /OverPlot
>
> ; Call MAP_SET and CONTOUR with filled contours
> Map_Set, /Grid, /Continents, Color=2, /Advance, $
> Title='IDL 5.2 Filled Contours (/FILL)...screwed up'
>
> Contour, TmpData, XArr, YArr, $
> Levels=C_Levels, C_Colors=C_Colors, /OverPlot, /Fill
> end
>
/cell_fill works
I am using
IDL5.2.1 on WinNT
You should never use /fill with overplots on maps.
The failure on your platform is that's /cell_fill won't work.
R.Bauer
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