[ncl-talk] CellFill issue: How to disable all fine white lines around each grid cell in ncl-PDF-output (example screenshot attached)

[Mary Haley]

Erik,

Thanks for providing a sample image.

I'm not an expert on how cell fill works, but did you try *not* setting
cnCellFillEdgeColor or cnCellFillMissingValEdgeColor at all?

I just tried to reproduce your problem by taking the example
dataonmap_11.ncl at:

http://www.ncl.ucar.edu/Applications/plot_data_on_map.shtml#ex11

and adding your two resource settings to it:

        res at cnCellFillEdgeColor=-1
         res at cnCellFillMissingValEdgeColor=-1

​I also modified the plot to zoom in on an area.  I couldn't get the
behavior that you're seeing. I've attached the script, PNG, and data file
if you want to try it yourself.

It would help if you could provide your script and data.  If you have a big
data file with lots of variables, then you can try setting the special
resource:

varR at gsnDebugWriteFileName​ = "mary_cell_fill_issue"

and then re-running the script. This should cause a NetCDF file called "
mary_cell_fill_issue.nc" to be created, with just the data required by the
script. It should also create a "mary_cell_fill_issue.ncl" script that you
can send me, that will hopefully be pared down version of your script that
is just the graphics, and none of the data processing.

--Mary


On Sun, Nov 20, 2016 at 5:49 PM, Erik Jan Schaffernicht <
eschaffe at uni-koeln.de> wrote:

> I attached a clearer example screenshot as some of the fine line were not
> visible in my first attachment (mail before).
>
>
> Attached, you find a screenshot of a plot produced by   ncl 6.3.0  (Ubuntu
> 16.04.01) .
>
> There are hundreds of very fine, rectangularly-spaced, vertical and
> horizontal white lines, likely exactly marking the boundaries of each grid
> cell of my input field (a netcdf file).
>
> How can I disable these fine white lines?
>
> They appear when I use  "CellFill".
>
> Currently, I create  "PDF" output with NCL.  I also tried "PS", same
> problem here.
>
> Here is an extraction of the ressources I use in my ncl plot script:
>
>    varR at cnFillOn     = T ;
>            varR at cnFillOpacityF=1
>            varR at cnFillMode="CellFill"
>             varR at cnCellFillEdgeColor=-1
>             varR at cnCellFillMissingValEdgeColor=-1
>
> By the way, I figured out that, if I set the    @cnCellFillEdgeColor=
> to a value of 0 or 1,  all these lines become really thick and eg. of bold
> white or black color. This is not what I want but maybe these ressources
> are somehow linked to my problem/solution?
>
> I like to let all cell-edge-lines disappear in my plot, so if I set this
> option to    @cnCellFillEdgeColor=-1
> but the lines are still there (attached), they do not disappear.
>
> Any idea/help on that?
>
> Erik
>
>
>
>
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