[ncl-talk] RasterFill and MissingValFill

[Dave Allured - NOAA Affiliate]

Adam,

I think this is a very old issue; I have seen this before with RasterFill.
Actually there IS a difference in how missing values are shaded, and it is
normal.  The problem is with the the perimeter lines, not the missing value
shading.

Missing value areas are drawn correctly in both modes, it is just that the
area shaded for non-missing data is naturally larger in RasterFill mode
than in AreaFill mode.  RasterFill draws the normal shaded data areas an
extra 1/2 cell width into missing value regions.

As far as I can remember, the missing value perimeter line has ALWAYS
followed edges as generated by AreaFill, regardless of alternate cnFillMode
settings.  I do not know whether there was ever any intention of changing
the perimeter line to follow the cnFillMode, or whether this was just a
feature intended only for normal AreaFill mode.  I did not find any clues
in ContourPlot documentation.  HTH.

--Dave


On Wed, Nov 18, 2015 at 4:45 PM, Adam Phillips <asphilli at ucar.edu> wrote:

> Hi Evelyn,
> There should not be any difference in how the missing values are shaded.
> Can you send us a simplified version of your script and data files so we
> can take a look?  If the data files are too big to send over ncl-talk you
> can use our ftp site:
> http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP
> Also, please let us know what version of NCL you are using..
> Adam
>
> On Tue, Nov 17, 2015 at 2:50 PM, Evelyn Grell - NOAA Affiliate <
> evelyn.grell at noaa.gov> wrote:
>
>> Hi,
>>
>> I am plotting cross-sections and was filling the area below ground with a
>> gray fill, more or less representing the terrain.  This seemed to be
>> working fine until I plotted a field using cnFillMode  = "RasterFill".  In
>> that case, the "missing" perimeter line is in the same place, but the gray
>> fill does not cover the entire area under the perimeter line.  See attached
>> plots.
>> Since I would like to compare plots -- some with rasterfill and some with
>> the default areafill, it is awkward to explain why the terrain looks
>> different.  Is there a way around this?  I can remove the perimeter line,
>> but the gray-filled area is different.
>>
>> Relevant resources:
>>
>>      res at cnMissingValPerimOn     = True
>>      res at cnMissingValFillColor   = "gray"
>>      res at cnMissingValFillPattern = 0
>>
>> The only difference between plots is whether this line is used:
>>      resDBZ at cnFillMode      = "RasterFill"
>>
>> Thanks,
>> Evelyn
>>
>
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