Re: Plotting Colors for Missing Values

Hi Dave,

Thanks for the report. We will look into this as soon as possible.
  -dave

On May 21, 2009, at 1:38 PM, David B. Reusch wrote:

> Hi Dave,
>
> This problem seems to have resurfaced on a different Mac (10.4 this
> time; though same results on 10.5) and different dataset
> (naturally ...). The fix you suggested back on May 8th worked fine
> with the original file. Now I get a much larger, still messed up
> PS file when I use these cn settings. The same behavior occurs
> with both of the WRF and MM5 netcdf files I've tried. I've
> included both in case you want to experiment. The included cn*ps
> files are from the WRF file. The default cn run gets the continent
> right but then bleeds out way beyond the data domain, as we were
> seeing before. With rasterfill, the contour lines are ok but the
> fill is messed up (though you can see the data domain at least).
> This config also takes a lot longer to run now.
>
> You can run this with
> ncl 'mon="198812"' plot_Tavg.ncl
> and you'll get a PS file beginning with "WRF"
>
> To run it with MM5
> ncl 'mon="198812"' 'var="t2"' 'model="MM5"' plot_Tavg.ncl
> and you'll get a PS file beginning with "MM5"
>
> All files can be downloaded in one tgz file from http://
> www.geosc.psu.edu/fetch.php?file=77
>
> Thanks!
> dave
>
> David Brown said the following on 5/8/09 4:27 PM:
>>
>> Hi David,
>>
>> I believe that the problem you are experiencing is different from
>> the missing values problem reported earlier. I am not totally sure
>> yet, but I think your problem is a floating point issue in the low
>> level contouring code that occasionally results in a fill coloring
>> 'bleeding' from a small contour area into a larger area where it
>> does not belong. This will take some work to track down. I ran
>> your code with versions 5.1.0, 5.0.0, and 4.3.0 and they all
>> exhibit the same problem.
>>
>> In the meantime, there is a workaround that generates results that
>> look okay as far as I can tell.
>> Use raster fill:
>>
>> res_at_cnFillMode = "rasterfill"
>> res_at_cnRasterSmoothingOn = True
>>
>> I will let you know when we make some more progress on this issue.
>> -dave
>>
>>
>>
>> On May 7, 2009, at 1:40 PM, David Reusch wrote:
>>
>>> Hello,
>>>
>>> I seem to be having the same "wrong colors for missing values"
>>> problem reported earlier this week, only the fix based on
>>> cnMissingValFillPattern and cnMissingValFillColor does not fix my
>>> plots. I expect white everywhere except on the Antarctic
>>> continent since all those points are _FillValues. Instead I
>>> always get colors like in the image below (and I have tried lots
>>> of color tables as well as explicitly adding White to the color
>>> table).
>>>
>>> My files can be found at http://www.geosc.psu.edu/fetch.php?
>>> file=75. To reproduce the output, use "ncl 'cntrs=(/0,500,50/)'
>>> plot_amsr.ncl" to match my contours.
>>>
>>> I am running ncl 5.1.0 on Mac OS 10.5.6.
>>>
>>> Thanks!
>>> Dave
>>>
>>> <amsr_accum_plot.png>
>>> --
>>> 517 Deike Building
>>> Earth & Environmental Systems Institute
>>> Penn State University
>>> University Park, PA 16802
>>>
>>> <amsr_accum_plot.png>
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>>
>
> --
> 517 Deike Building
> Earth & Environmental Systems Institute
> Penn State University
> University Park, PA 16802
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Received on Thu May 21 2009 - 15:11:08 MDT