[ncl-talk] Plotting several variables into one Hovmuller plot

[Toni Klemm]

Hello!

I emailed earlier (see below) about a complex graphics problem, plotting 3 variables in one Hovmueller plot and then four Hovmueller plots into one panel (I didn’t mention the panel). After some offline advice I tried gsn_attach_plots and overlay, but unfortunately neither worked.

gsn_attach_plots only plotted the charts connected along the X *or* Y axis, but not both at the same time (so that they would basically be on top of each other). overlay only allowed me to overlay 2 plot, but I needed 3.

My laborious solution was creating 3 sets of panel plot, one for each of the 3 variables, separately in NCL, and then layering them on top of each other in Photoshop and removing the white space in the plots so that the underlying layer becomes visible. I also rearranged the color bars and named them.

I attached a sample plot. If anyone knows how to automate all of this in NCL, I would be very grateful.

Thanks in advance,
Toni


Toni Klemm, Ph.D.
Postdoctoral Research Associate
Department of Ecosystem Science and Management
College of Agriculture and Life Sciences
Texas A&M University, College Station, TX
Contributor to the Early Career Climate Forum <https://www.eccforum.org/>
www.toni-klemm.de <http://www.toni-klemm.de/> | @toniklemm <https://twitter.com/ToniKlemm>





> On Sep 10, 2018, at 6:50 PM, Toni Klemm <toni-klemm at tamu.edu> wrote:
> 
> Hello!
> 
> I’m trying to plot three variables, percentages of land cover of grasses, shrubs, and trees, into one Hovmueller plot (gsn_csm_hov <https://www.ncl.ucar.edu/Applications/time_lon.shtml>, longitude vs. years). I have the data arranged such that each grid point will only show one land cover type, namely the one with the largest percentage. In principle, this is similar to the seasonal tercile forecasts by the US Climate Prediction Center <http://www.cpc.ncep.noaa.gov/products/predictions/long_range/lead14/index.php> that show the likelihood for above, below, and near normal temperature (see the map attached). The difference in my case is I need to plot time vs. longitude, not latitude vs. longitude.
> 
> I would appreciate any help for integrating three variables into one plot. Each variable will also need its own legend (like in the map).
> 
> Thank you very much!
> 
> Toni
> 
> 
> Toni Klemm, Ph.D.
> Postdoctoral Research Associate
> Department of Ecosystem Science and Management
> College of Agriculture and Life Sciences
> Texas A&M University, College Station, TX
> Contributor to the Early Career Climate Forum <http://www.eccforum.org/>
> www.toni-klemm.de <http://www.toni-klemm.de/> | @toniklemm <http://twitter.com/toniklemm>
> 
> 
> 
> <off15_temp.gif>
> 
> 
> 
> <Screen Shot 2018-09-10 at 6.28.47 PM.png>

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