[ncl-talk] overlay standardized Geopotential height

[Adam Phillips]

Hi Jonathan,
If all you want is one positive and one negative contour, you can set:
res1 at cnLevels =  (/-80.,80./) ; Diffs
The zero contour is not needed if all you want is two contours.
Adam

On Wed, Jul 7, 2021 at 11:45 PM Buzan, Jonathan <jbuzan at purdue.edu> wrote:

> Hi Adam,
>
> Yes, I have plotted the PI_Z_rmMean array. I have one set of plots that
> are the absolute standardized Geopotential heights. The second set are
> comparisons. I want to overlay the general pattern PI_Z_rmMean onto other
> plots, which is why I was creating another array with restricted values. To
> keep the plot from getting messy, I only want to plot 1 contour positive
> and 1 contour negative.
>
> I think changing:
>  res1 at cnLevels =  (/-160.,-80.,80.,160./) ; Diffs
>  res1 at cnLevels =  (/-80.,0.,80./) ; Diffs
>
> Would fix that?
>
> Cheers,
> -Jonathan
>
>
>
> On Jul 8, 2021, at 12:29 AM, Adam Phillips <asphilli at ucar.edu> wrote:
>
> 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
>> <Screen Shot 2021-07-07 at 4.18.42 PM.png>
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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>
>
>
>

-- 
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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