[ncl-talk] taylor_diagram question

[Tao Zhang]

Hi Adam,

  Thanks for your great recommendations.

  1) Dennis Shea mentioned that the Taylor diagram listed in NCL website 
is hard-coded for normalized standard deviation, not for standard deviation
  as shown in previous link I provided, right?

  2) How to remove the "0.75" "1" labels close to correlation value? I 
just want to keep one. Is possible to
    add "0.25"?  see attached plot.

  Thanks
  Tao


On 4/3/23 4:01 PM, Adam Phillips wrote:
> Hi Tao,
> I believe you corresponded with someone offline about this. I have 
> some experience modifying the taylor_diagram function, but I have not 
> done what you are looking for so I can only offer recommendations. You 
> will likely need to make several attempts getting all the resources 
> set the way you want; hopefully your test script runs quickly!
>
> To answer your 3 questions:
> 1 - Yes.
> 2 - I believe this is possible. Steps required:
>    - Copy the taylor_diagram.ncl 
> <https://www.ncl.ucar.edu/Applications/Scripts/taylor_diagram.ncl> code, 
> and saving it as (say) taylor_diagram_2.ncl.
>    - Alter the function name at the top to taylor_diagram_2 (at line 
> one of taylor_diagram_2.ncl).
>    - In your new function, go to the section entitled "Part 3". You 
> will see a resource list that is initiated 5 lines beneath "Part 3" 
> named respl. I would try adding the following resource settings 
> *beneath* the current respl resource settings:
>      respl at gsLineDashSegLenF = 0.30.   ; Controls spacing between line 
> labels; this setting will require some trial and error.
>      respl at gsLineLabelFontColor = respl at gsLineColor
>      respl at gsLineLabelFontHeightF = 0.0125.   ; this font height 
> setting might need adjustment
>
>   - Then, within the "do n-1,ncon" do loop, you will need to tell NCL 
> how to label the lines, so try this:
>       do n=1,ncon
>            rr  = n*dx
>            res at gsLineLabelString = rr.   ; add this line
>
> That should do it. As I stated in the comments above, you will likely 
> need to adjust the setting for gsLineDashSegLenF and 
> gsLineLabelFontHeightF.
>
> 3 - Yes. Search within the function for the resource "gsLineColor". 
> You can adjust these as needed.
>
> Hope that helps!
> Adam
>
> On Sat, Mar 25, 2023 at 3:00 PM Tao Zhang via ncl-talk 
> <ncl-talk at mailman.ucar.edu> wrote:
>
>     Hi,
>
>       I can reproduce the taylor_4 figure using the sample script in
>
>     https://www.ncl.ucar.edu/Applications/Images/taylor_4_1_lg.png
>
>     https://www.ncl.ucar.edu/Applications/Scripts/taylor_4.ncl
>
>     But I want  Figure 1 in
>
>     https://en.wikipedia.org/wiki/Taylor_diagram#:~:text=Taylor%20diagrams%20are%20mathematical%20diagrams,comparative%20assessment%20of%20different%20models
>
>     Which shows the standard deviation (0~4 mm/day), not the standardized
>     deviations (normalized) (0-1.5).
>
>     1) May I only change the taylor_4.ncl for my purpose, but keep the
>     loaded "taylor_diagram.ncl" unchanged?
>
>     2) How to add "observed value" in the Taylor diagram as shown in
>     Figure
>     1 in above link?
>
>     3) How to change the color in 3 lines of standard deviation,
>     correlation, and RMS?
>
>     Thanks
>
>     Tao
>
>
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>
>
> -- 
> Adam Phillips
> Associate Scientist IV, Climate Analysis Section
> Climate and Global Dynamics Laboratory
> National Center for Atmospheric Research
> www.cgd.ucar.edu/staff/asphilli/ 
> <http://www.cgd.ucar.edu/staff/asphilli/>
>
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