[ncl-talk] Plot with two color maps not getting southern hemisphere values

[Adam Phillips]

Hi Ioana,
You are setting cnLevelSelectionMode = "ExplicitLevels", but you are
setting cnMinLevelValF, cnMaxLevelValF, and cnLevelSpacingF. If you want to
set those three resources, you need to set cnLevelSelectionMode =
"ManualLevels".

See example #1 here:
http://www.ncl.ucar.edu/Applications/contourLev.shtml#ex1

If you have any further questions please let ncl-talk know.
Adam


On Wed, Oct 28, 2015 at 2:20 PM, Ioana Colfescu <ioana.colfescu at ed.ac.uk>
wrote:

> Hi,
> I'm trying to plot a field using two color maps - one for the 'higher
> latitudes' and another one for the tropics. The area in the lower lats I
> try to plot is S to N for example 25S to 25N.When I try to plot this area,
> using the second color bar it doesn't work ( see plot attached - second
> color bar starts at around 0 not -25) so I only get the positive plotted
> values.
> I attached the plot and the code part that is relevant to the problem I
> have. Could anyone please help me figure out what should I do to have the
> second plot from 25S to 25N ?
>
> ..............................................
>   res at vpXF                  = 0.08
>   res at vpYF                  = 0.88
>   res at vpWidthF              = 0.80
>   res at vpHeightF             = 0.60
>   res at sfXArray              = lon
>   res at sfYArray              = lat
>   res at gsnAddCyclic          = False
> ; resources for the two plots
>   tres                       = res
>   dres                       = res
>
> ;---set resources specific to  plot 1
>   tres at cnLevelSelectionMode  = "ExplicitLevels"
>   res at cnMinLevelValF       = -0.08                ; set min contour level
>   res at cnMaxLevelValF       =  0.08               ; set max contour level
>   res at cnLevelSpacingF      =  0.006
>   tres at mpDataSetName         = "Earth..4"
> .......................................
>   tres at mpMinLatF             = min(lat)    ; zoom in on map
>   tres at mpMaxLatF             = max(lat)
>   tres at mpMinLonF             = min(lon)
>   tres at mpMaxLonF             = max(lon)
>   tres at tiMainOffsetYF        = -0.04   ; moves title closer to plot.
>
> ;---set resources specific to second plot
>   dres at cnLevelSelectionMode  = "ExplicitLevels"
>   dres at cnMinLevelValF       = -0.008                ; set min contour
> level
>   dres at cnMaxLevelValF       =  0.008               ; set max contour level
>   dres at cnLevelSpacingF      =  0.0006
>   dres at lbOrientation         = "Vertical"
>   dres at pmLabelBarOrthogonalPosF = -0.01    ; move labelbar closer to plot
> ........................................
>   dres at mpShapeMode  = "FreeAspect"
>   dres at vpWidthF      = 0.8
>   dres at vpHeightF     = 0.4
>   dres at lbLabelFontHeightF =.01                 ; make labels larger
>   ter_plot = gsn_csm_contour_map(wks,agcms1(1,1,:,:),tres)
>
>   dbz_plot = gsn_csm_contour(wks,agcms1(1,1,{-25:25},:)*100,dres)
>   overlay(ter_plot,dbz_plot)
>   draw(ter_plot)
>   frame(wks)
>
> Thanks,
> Ioana
>
>
>
>
>
>
>
>
>
>
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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