[ncl-talk] overlay standardized Geopotential height

[Adam Phillips]

Hi Jonathan,
I wouldn't worry about the "Contour from -160 to 160 by 106.7" label so
much. I would think that the cnInfoLabelOn  resource would default to False
when you are setting ExplicitLevels.  Otherwise, assuming you are setting
gsnDraw/gsnFrame to False in each resource list (res and res1) I don't see
anything wrong with what you are doing. Did you mean to plot the
PI_Z_rmMean array as opposed to your PI_Z_rmMean_contrained array?
Adam

On Wed, Jul 7, 2021 at 8:20 AM Buzan, Jonathan via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi NCL-Talk,
>
> I am attempting to overlay contours of standardized Geopotential height
> over changes in standardized Geopotential height. All I want to have in the
> overlay is a zone of positive and a zone of negative values. But I am
> having trouble understand how this is working. Especially since the contour
> intervals do not make sense (in the example below).
>
> Cheers,
> -Jonathan
>
>
> Code snippets.
> ; generate positive and negative zone
> PI_Z_rmMean_contrained = PI_Z_rmMean
> PI_Z_rmMean_contrained =
> where(PI_Z_rmMean.ge.80..or.PI_Z_rmMean.lt.-80.,PI_Z_rmMean,PI_Z_rmMean@
> _FillValue)
>
>      res1 at cnLevelSelectionMode = "ExplicitLevels"
>      res1 at cnLevels =  (/-160.,-80.,80.,160./) ; Diffs
>      res1 at gsnContourNegLineDashPattern = 1       ; sets negative contours
> to dash pattern 1
>      res1 at cnLineThicknessF = 1.
>
>      plotPI = gsn_csm_contour(wks,PI_Z_rmMean(0,0,:,:),res1)
>
>     plotLGMvsPI = gsn_csm_contour_map(wks,LGM100_vs_PI(0,0,:,:),res)
>     overlay(plotLGMvsPI,plotPI)
>     plotTemp(0) = plotLGMvsPI
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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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