[ncl-talk] Adding a marker on a contouring map

[Guido Cioni]

What you did was right and I cannot see any obvious errors in your code.
Usually if you get no errors it's because the marker get placed but
somewhere where you don't expect, or maybe the marker size is too small,
but that's not your case, 5 should be big enough.

Can you share a minimal working version of your script and data?
You could also try to change the bounds of your map projection to include
all the globe and see where your marker is wandering around :-)

Il mer 20 giu 2018, 11:54 <G.Monte at isac.cnr.it> ha scritto:

> Dear all,
> I would like to add a marker for a given latitude-longitude
> (45.43°N,12.12°E) on a contouring map in NCL 6.4.0. For the plot, I used
> gsn_csm_contour_map function and I need only a single marker to add in. I
> tried the following commands:
>
> polyres                   = True
> polyres at gsMarkerIndex     = 16
> polyres at gsMarkerSizeF     = 5.
> plot =  gsn_csm_contour_map(wks,Z_region,res)
> dum  =  gsn_add_polymarker(wks,plot,12.12,45.43,polyres)
> draw(plot)
>
> and no error messages appeared, but marker was not added on the map anyway.
> I do not understand the reason; maybe, I think that gsn_add_polymarker
> function would be suited only for several markers. Are there existing
> other functions to add a single marker on a NCL contouring map?
>
> Thanks,
> Giulio Monte
>
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