[ncl-talk] zoom bug with Area Fill?

[Fröhlich Kristina]

Thanks Mary,

yes „lonFlip“ helps! I think this is the best workaround at the moment.

Originally I did not use the gsnAddCyclic because there was no need to, then I started to set it True/False in combination with other switches but it doesn’t change anything. That’s why the resource is commented. Even now I can’t see a change between the two options.

Cheers, Kristina


Von: Mary Haley [mailto:haley at ucar.edu]
Gesendet: Dienstag, 10. Mai 2016 21:08
An: Fröhlich Kristina
Cc: ncl-talk at ucar.edu
Betreff: Re: [ncl-talk] zoom bug with Area Fill?

Kristina,

The problem seems to be related to your longitudes going from 0 to 358, and not -180 to 178. Also, you set gsnAddCyclic to False, but I think you want it to be True.

If I replace this line:
    MM3=ANOF->Ano
with this line:
    MM3 = lonFlip(ANOF->Ano)
then it works.
Let me know if this doesn't fix the problem on your end.  I will file a bug report using your data, since it should work regardless if your longitudes go from -180 to 180 or 0 to 360.
--Mary



On Tue, May 10, 2016 at 11:47 AM, Mary Haley <haley at ucar.edu<mailto:haley at ucar.edu>> wrote:
Hi Kristina,

Thanks for providing a script and data. I'll have a look shortly.

One possible work-around for the raster contours is to set:

res at cnRasterSmoothingOn = True

Sometimes this gets you the same results as AreaFill.  It just depends on how dense your grid is.

--Mary


On Tue, May 10, 2016 at 5:58 AM, Fröhlich Kristina <Kristina.Froehlich at dwd.de<mailto:Kristina.Froehlich at dwd.de>> wrote:

Dear colleagues,

Just recently I found out, what causes sometimes (not always) a disturbed picture for a Europe zoom of ECHAM6 variables. While plotting correctly the whole globe NCL (6.2.0 and 6.2.1)  refuses for the first time step to do  properly the interpolation needed for the Area Fill over Europe. It does fine so for the second time step.

I played around with variable types and colormaps but it seems to come down to the resource of the Area Fill. As long, as I don’t provide fix cnLevels its fine again but looks ugly.
As a work around I switched back to RasterFill which looks of course not so nice but does everything as wanted. I uploaded the ncl script and a testdata onto the ftp server as “AreaFillBug.tar”.

Is there a way for AreaFill?

Best regards, Kristina


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