[ncl-talk] Strange issue on plotting

Fri Oct 1 16:04:40 MDT 2021

Adam,

Happened to see your email quick enough to do a check of trying RasterFill.
I did not have that set. That did the trick! I didn't have to change my
contour levels either. That makes sense that using RasterFill would fix it.

Thanks again,

On Fri, Oct 1, 2021 at 5:56 PM Adam Phillips <asphilli at ucar.edu> wrote:

> Hi Andrew,
> I think you have happened upon a rare NCL graphics bug. I have seen this
> issue when all the data falls within one contour interval (say 2-3 in your
> case), but it is quite rare. That is not the case here, as your "Automatic
> Levels" plots show values in the regional plot varying between 2.5 and 30.
> I too am puzzled by the absence of any error messages when the failed
> all-green plot is drawn.
>
> Are you setting cnFIllMode = "RasterFill"? I thought you were, but now I
> am not so sure. If not I would say try it (with ExplicitLevels). Other
> things to try are setting your contour levels (very slightly) differently,
> for example setting the bottom contour = 0.1000001 (but you can still label
> it as 0.1).
>
> Beyond that, I unfortunately do not know what to suggest. Perhaps another
> user has encountered this issue before and can offer a solution.
> Adam
>
> On Fri, Oct 1, 2021 at 1:56 PM Andrew Kren - NOAA Federal <
> andrew.kren at noaa.gov> wrote:
>
>> All,
>> As you suspected, switching to AutomaticLevels fixed the issue. I am
>> sharing the plots of zoomed in map/regional map for AutomaticLevels and my
>> ExplicitLevels. I see that the values are out of range, but confused why it
>> didn't error out on the regional map? Does this mean I can't set my own
>> levels?
>>
>> Thanks,
>>
>> On Wed, Sep 29, 2021 at 3:31 PM Adam Phillips <asphilli at ucar.edu> wrote:
>>
>>> Joseph: Thanks for jumping in! I was wondering if it was the same issue
>>> you identified. Andrew: Please let us know the results..
>>> Adam
>>>
>>> On Wed, Sep 29, 2021 at 1:18 PM Andrew Kren - NOAA Federal <
>>> andrew.kren at noaa.gov> wrote:
>>>
>>>> I'll try that.
>>>>
>>>> On Wed, Sep 29, 2021 at 2:09 PM Joseph Clark <jpclark186000 at gmail.com>
>>>> wrote:
>>>>
>>>>> Sorry for jumping in here. Perhaps set resources at cnLevelSelectionMode
>>>>> = "AutomaticLevels". My guess is your data is out of the range on your
>>>>> color bar on these days. I think the automatically generated color bar will
>>>>> tell you what the range of your data values are.
>>>>>
>>>>> On Wed, Sep 29, 2021, 1:58 PM Andrew Kren - NOAA Federal via ncl-talk <
>>>>> ncl-talk at mailman.ucar.edu> wrote:
>>>>>
>>>>>> Hi Adam,
>>>>>> Thanks for the quick reply. There are no error messages when it plots
>>>>>> the two regions. I would say no to your second question. For example, for
>>>>>> the same hour, the regional map shows a totally different picture but the
>>>>>> zoomed in version is all one color. I am using the same HRRR grid to plot
>>>>>> both regions. Could it be that I need to use a different fill type (raster
>>>>>> vs another) since the data can be sort of non-uniform and NCL is trying to
>>>>>> smoothly contour it?
>>>>>>
>>>>>> On Wed, Sep 29, 2021 at 1:11 PM Adam Phillips <asphilli at ucar.edu>
>>>>>> wrote:
>>>>>>
>>>>>>> Hi Andrew,
>>>>>>> 2 questions:
>>>>>>> 1 - Are any error messages returned when the plot with the red fill
>>>>>>> occurs?
>>>>>>> 2 - Is there a chance that the HRRR data for that particular metric
>>>>>>> and region all fits into one contour interval (as for example all the data
>>>>>>> has values say greater than 50kft, or all data falls between 5-10kft)?
>>>>>>> Adam
>>>>>>>
>>>>>>> On Wed, Sep 29, 2021 at 2:48 AM Andrew Kren - NOAA Federal via
>>>>>>> ncl-talk <ncl-talk at mailman.ucar.edu> wrote:
>>>>>>>
>>>>>>>> Hi there,
>>>>>>>>
>>>>>>>> I'm wondering if anyone has ever run into this issue when plotting.
>>>>>>>> I am contouring HRRR cloud ceiling data on a regional and local domain of
>>>>>>>> NC. For certain hours, there is one color on top of the map, such that it
>>>>>>>> appears the contouring didn't work correctly. This is only found on the
>>>>>>>> smaller domain and not the regional domain for the same time periods. I
>>>>>>>> thought maybe this was related to me using a triangular mesh, but that
>>>>>>>> wouldn't fully make sense. I am attaching the images.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>>
>>>>>>>> --
>>>>>>>>
>>>>>>>> Andrew Kren
>>>>>>>> Meteorologist
>>>>>>>> NOAA's National Weather Service
>>>>>>>> Raleigh Forecast Office
>>>>>>>> 1005 Capability Drive, Suite 300
>>>>>>>> Raleigh, North Carolina 27606
>>>>>>>> voice: 919-326-1035
>>>>>>>> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> ncl-talk mailing list
>>>>>>>> ncl-talk at mailman.ucar.edu
>>>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>>>> https://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Adam Phillips
>>>>>>> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
>>>>>>> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>>>>>>>
>>>>>>> <http://www.cgd.ucar.edu/staff/asphilli>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>>
>>>>>> Andrew Kren
>>>>>> Meteorologist
>>>>>> NOAA's National Weather Service
>>>>>> Raleigh Forecast Office
>>>>>> 1005 Capability Drive, Suite 300
>>>>>> Raleigh, North Carolina 27606
>>>>>> voice: 919-326-1035
>>>>>> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> ncl-talk mailing list
>>>>>> ncl-talk at mailman.ucar.edu
>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>> https://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>
>>>>>
>>>>
>>>> --
>>>>
>>>> Andrew Kren
>>>> Meteorologist
>>>> NOAA's National Weather Service
>>>> Raleigh Forecast Office
>>>> 1005 Capability Drive, Suite 300
>>>> Raleigh, North Carolina 27606
>>>> voice: 919-326-1035
>>>> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>>>>
>>>>
>>>>
>>>
>>> --
>>> Adam Phillips
>>> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
>>> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>>>
>>> <http://www.cgd.ucar.edu/staff/asphilli>
>>>
>>
>>
>> --
>>
>> Andrew Kren
>> Meteorologist
>> NOAA's National Weather Service
>> Raleigh Forecast Office
>> 1005 Capability Drive, Suite 300
>> Raleigh, North Carolina 27606
>> voice: 919-326-1035
>> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>>
>>
>>
>
> --
> Adam Phillips
> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>
> <http://www.cgd.ucar.edu/staff/asphilli>
>

-- 

Andrew Kren
Meteorologist
NOAA's National Weather Service
Raleigh Forecast Office
1005 Capability Drive, Suite 300
Raleigh, North Carolina 27606
voice: 919-326-1035
mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
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