[ncl-talk] Removing line over ocean for soil moisture+ reversing color of plot

[Setareh Rahimi]

Dear Adam,
So many many thanks for your help. I appreciate the time you consider
fixing the issue.
Best wishes,

On Fri, May 27, 2022 at 2:22 AM Adam Phillips <asphilli at ucar.edu> wrote:

> Hi Setareh,
> So the problem turned out to be NaN values in the first timestep of your
> plotted array (anom). NCL typically does not plot arrays with NaN's in a
> graceful manner, and can return weird results without any kind of error
> whatsoever. Strangely, setting cnFillMode = "RasterFill" sidestepped the
> problem. But a better solution was to set all the NaN values to anom at _FillValue
> using the replace_ieeenan
> <https://www.ncl.ucar.edu/Document/Functions/Built-in/replace_ieeenan.shtml>
> function. I also adjusted your vpWidth/Height settings to be within a valid
> range (from 0->1) and adjusted your font sizes a bit. I have attached the
> script and resulting plot.
> Adam
>
> On Thu, May 26, 2022 at 2:15 PM Setareh Rahimi <setareh.rahimi at gmail.com>
> wrote:
>
>> Dear Adam,
>> So many thanks for your advice. Yes, I confirm that the plot I sent has
>> been created by the attached script.
>> I downloaded the data set from the link below:
>> https://psl.noaa.gov/data/gridded/data.cpcsoil.html
>> https://downloads.psl.noaa.gov/Datasets/cpcsoil/soilw.mon.mean.v2.nc
>> "monthly mean"
>> Best wishes,
>>
>> On Fri, May 27, 2022 at 12:13 AM Adam Phillips <asphilli at ucar.edu> wrote:
>>
>>> Hi Setareh,
>>> Thanks for sending a short script and data file. Unfortunately the data
>>> file (for me) is corrupted so I cannot run the script. Looking at your
>>> script/plot though, I see that you are setting mpFillOn = False, but it
>>> looks to me like the land in your plot is getting filled with gray (before
>>> the color fill is applied).
>>>
>>> The reason I am asking this is that the weird contouring that you are
>>> seeing over the ocean in the first panel is similar to an issue I have seen
>>> when color filling an incomplete array when mpFIllOn is set to True. So
>>> please verify that the script you sent creates the plot that you attached.
>>>
>>> If it does, please write out your anom array (which should be much
>>> smaller than your original data file) and send it to ncl-talk.
>>>
>>> Something simple like this should work:
>>> anom = calcMonAnomTLL(prc,prcClm)
>>> v = addfile("anom.nc","c")
>>> v->anom = anom
>>>
>>> Adam
>>>
>>>
>>>
>>> On Thu, May 26, 2022 at 9:55 AM Setareh Rahimi via ncl-talk <
>>> ncl-talk at mailman.ucar.edu> wrote:
>>>
>>>> Dear Rick,
>>>> Thank you for your advice. I got no errors or warnings regarding the
>>>> script. I just wonder why there are values over the ocean!
>>>> Best wishes,
>>>>
>>>> On Thu, May 26, 2022 at 8:17 PM Rick Brownrigg <brownrig at ucar.edu>
>>>> wrote:
>>>>
>>>>> To your 1st question, were there any errors or warnings reported by
>>>>> NCL?
>>>>>
>>>>> On the 2nd question, it looks like you are setting your colors with
>>>>> this line:
>>>>>
>>>>>     res at cnFillPalette        = "perc2_9lev"
>>>>>
>>>>> Perhaps try:
>>>>>
>>>>>    cmap = read_colormap_file("perc2_9lev")
>>>>>    res at cnFillPalette = cmap(::-1, :)
>>>>>
>>>>> Take a look at the documentation for cnFillPalette for discussion on
>>>>> how there might be two extra colors in the new palette; I don't know if
>>>>> that matters to what you are trying to do:
>>>>>
>>>>>
>>>>> http://ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnFillPalette
>>>>>
>>>>> HTH...Rick
>>>>>
>>>>>
>>>>> On Thu, May 26, 2022 at 8:47 AM Setareh Rahimi via ncl-talk <
>>>>> ncl-talk at mailman.ucar.edu> wrote:
>>>>>
>>>>>>
>>>>>> Dear all,
>>>>>> I plotted the monthly anomaly of soil moisture, however, after
>>>>>> plotting I noticed that for the month of January there are some lines
>>>>>> over the Atlantic ocean. I wonder why this happened, please? The
>>>>>> script, image,
>>>>>>  soilw.mon.mean.v2.nc
>>>>>> <https://drive.google.com/file/d/1vl3N7Ptg0NnQGDBWOToGjj9CdcD9Fnr-/view?usp=drive_web>
>>>>>> and the data set have been attached.
>>>>>> I have another question. How can I reverse the color of the map,
>>>>>> please?
>>>>>> Please kindly advise me.
>>>>>> Thanks in advance,
>>>>>> Best wishes,
>>>>>> --
>>>>>> S.Rahimi
>>>>>>
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>>>>>>
>>>>>
>>>>
>>>> --
>>>> S.Rahimi
>>>>
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>>>
>>>
>>> --
>>> 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>
>>>
>>
>>
>> --
>> S.Rahimi
>>
>>
>
> --
> 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>
>


-- 
S.Rahimi
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