[ncl-talk] Contour plot fill error with low values

[Guido Cioni]

Bumping up this issue in case it was lost in translation. 

> On 9. Jul 2018, at 12:13, Guido Cioni <guidocioni at gmail.com> wrote:
> 
> Dear all,
> I've been struggling with this problem for a while now, and that led me to believe that I may have discovered a bug or at least an unexpected behaviour.
> 
> Little bit of background. I process NWP model output daily for my website and among the multiple plots that I do with NCL there is one that uses mid- low-level clouds, precip. and snow on the same map. Now, what happens sometimes is that values of either rain or snow are really small or even 0. Although I have fixed explicit levels, this causes the plotting routine to produce the warning 
> 
> warning:ContourPlotSetValues: Data values out of range of levels set by EXPLICITLEVELS mode
> 
> and fill the entire contour area with a single color, as you can see in the animation that I'm attaching. This basically covers everything on the plot, making any interpretation of the results impossible. I think that, even in the case of low values, the entire area should stay transparent...
> 
> <output.gif>
> Is there any way to fix this?
> 
> I'm attaching an example script. 
> <plot_rain_clouds_nord.ncl>
> Cheers 
> 
> Guido Cioni
> http://guidocioni.altervista <http://guidocioni.altervista/>.org
> 


Guido Cioni
http://guidocioni.altervista <http://guidocioni.altervista/>.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180725/f8bb7528/attachment.html>