>I am trying to use 2 different color tables in a panel plot. Basicaly,
>I am comparing 2 fields and I want to plot each file and their
>difference. The difference should have a different color table than the
>fields themselves.
>
>Has anyone ever done that ?
==========================================
yes
==========================================
[1] http://www.ncl.ucar.edu/Applications/panel.shtml
see Examples 12 and 15
These examples show two lable bars from the same color map.
[2] Note that "gsn_panel(wks,...)" uses the color map associated
associated with 'wks' and only one color map can be associated
with each workstation. (NCL's graphics use the Graphical Kernal
System [GKS] and this allows only one colormap/workstation).
[3] However, there are ways to address the situation.
(a) you can use a colormap that has many colors
and explicitly specify
the colors desired. This still uses one predefined color map.
http://www.ncl.ucar.edu/Applications/color.shtml
See Example 7
(b) you can combine two color maps
http://www.ncl.ucar.edu/Applications/color.shtml
See Example 9
Then you can use the gsn resources to
specify the range of colors.
specific to each original color map. Let's say the combined
color map has colors 2 to 15 from the 1st colormap and 16 to 80
are from the 2nd color map. Both are available to the wks.
The resources are:
res@gsnSpreadColors = True ; use full color map
res@gsnSpreadColorStart = 3 ; start at 3
res@gsnSpreadColorEnd = 15 ; end at 15
:
:
plot(n) = ...
res@gsnSpreadColorStart = 16
res@gsnSpreadColorEnd = 79
plot(n) = ...
Cheers
D
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