[ncl-talk] How to show P value and Trend on contour fill map?

[Adam Phillips]

Hi Atul,
In general, NCL denotes areas that are missing graphically by coloring them
white unless modified by the user. There are no white
areas on your trend plot, and thus I am guessing that NCL believes that the
plotted grid does not have any missing data. Note that in
the trend_manken documentation that missing values are not allowed to be
input into the function. If you do have missing data
(denoted by the _FillValue attribute) within your b array, and the b array
grid points are consistently missing in time,
I would use the where function to wipe out the results from trend_manken
over those areas that were missing:
mk=trend_manken(b,opt,0)
copy_VarCoords(aveg,mk)
mk1=mk(0,:,:)
mk2=mk(1,:,:)
mk1 = where(ismissing(b(0,:,:),mk1 at _FillValue,mk1)
mk2 = where(ismissing(b(0,:,:),mk2 at _FillValue,mk2)

The above coding assumes b at _FillValue, mk1 at _FillValue, and mk1 at _FillValue
are properly set, and that b(0,:,:) is representative of the
areas that need to be masked.

If that advice does not fix the issue reply to the ncl-talk email list.
Adam



On Thu, Dec 12, 2019 at 2:47 AM Atul Saini via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Hi NCL,
>                I have modified the script and I think I am getting the
> right plot having modified the script.
>                If, I followed the right method to plot 'probability level'
> and 'trend value', please tell me why I am getting the value for the region
> having missing values.
>
> Regards,
>
>
>
>
>
> On Thu, Dec 12, 2019 at 2:56 PM Atul Saini <atulsainimail at gmail.com>
> wrote:
>
>> Hi NCL,
>>               I wrote the code to make map for P value and second for
>> Trend value. But, I can't understand the process of selecting P value at
>> the time of plot and Trend value.
>>
>> Please find the attached data file and script and suggest the way to plot
>> P value and Trend value.
>>
>>
>> Regards,
>>
>>
>>
>>
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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>
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