[ncl-talk] attached zonal plot

[Mary Haley]

Hi Jonathan,

The gsn_csm_attach_zonal_means_plot is really meant for just one zonal
means, and doesn't have any hooks for extra lines.

There's unadvertised function called gsn_csm_zonal_means which is called by
the gsn_csm_attach_zonal_means plot. It basically creates the XY zonal
means plot under the hood and returns it. The
gsn_csm_attach_zonal_means function calls this function and then attaches
the zonal plot to the right of an existing map plot.

Using gsn_csm_zonal_means, I created the two zonal means plots myself, used
"overlay" to overlay them into one plot, and then attached the overlaid XY
plots myself using gsn_add_annotation.

See the attached zonal.ncl example and resultant PNG image.  I didn't have
time to find a dataset that would produce a more interesting zonal plot, so
I just used a standard one that you can download from:

http://www.ncl.ucar.edu/Applications/Data/cdf/ts_Amon_CESM1-CAM5_historical_r1i1p1_185001-200512.nc

You will likely want to modify the "attach_zonal_plots_to_map_plot"
function in this script to customize how you want the zonal means plots to
appear, for example, what color to use for the XY lines, how wide to make
the plot, what X/Y axes min/max values you want, etc.

--Mary



On Wed, Nov 2, 2016 at 2:44 PM, Buzan, Jonathan R <jbuzan at purdue.edu> wrote:

> Hi NCL,
>
> I am attempting to plot zonal means of my two sets of data.  However,
> every time it tries to plot the zonal means, even with the same trXMaxF
> and trXMinF, the zonal plots do not match on the same grid (see attached).
> Is there a way to fix this?
>
> -Jonathan
>
>
> ex. plot lines.
>
>   zres at trXMinF              = 0.      ; Could also use gsnZonalMeanXMinF
>   zres at trXMaxF              = 3.      ; Could also use gsnZonalMeanXMaxF
>   zres at trYMinF              = -57
>   zres at trYMaxF              =  57
>   zres1 at trXMinF              = 0.      ; Could also use gsnZonalMeanXMinF
>   zres1 at trXMaxF              = 3.      ; Could also use gsnZonalMeanXMaxF
>   zres1 at trYMinF              = -57
>   zres1 at trYMaxF              =  57
>
>     plots = gsn_csm_contour_map(wks,tmp_var(:,:),res)
>     plots1 = gsn_csm_contour(wks,tmp_var1(:,:),res2)
>     plots1  = gsn_contour_shade(plots1,minshade,maxshade,opt)
> overlay(plots,plots1)
>   zonal_id1 = gsn_csm_attach_zonal_means(wks,plots,tmp_var1(:,:),zres)
>   zonal_id2 = gsn_csm_attach_zonal_means(wks,plots,tmp_var(:,:),zres1)
>
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