[ncl-talk] plotting I J variables from the WRF out file

[Dennis Shea]

Actually, it is not quite clearer what you are looking for:

As indicated by Rick  *wrf_user_ij_to_ll*
<https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_ij_to_ll.shtml>

other possibilities include the following very similar functions:

*region_ind*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/region_ind.shtml>
and  *getind_latlon2d*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/getind_latlon2d.shtml>

*You* must experiment. Please use print statements like *printVarSummary *while
debugging.
The output from *printVarSummary *is for you to look at to examine variable
type and shape, etc.

On Sun, May 10, 2020 at 7:45 PM Rick Brownrigg via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hi,
>
> Please do not reply directly back to me, but rather to the group as a
> whole -- they provide a broader pool of expertise to draw upon.
>
> I *think* wrf_user_ij_to_ll work() will do what you want, but it will
> likely require some experimentation. Liberal use of printVarSummary() is
> your best friend ;-)
>
> Rick
>
>
>
> On Sun, May 10, 2020 at 3:03 PM ali mughal <mughalali655 at gmail.com> wrote:
>
>> Dear Rick
>>
>> Thanks for the reply.
>>
>> In continuation to my previous email, I asked that in the shared the
>> first two columns represent I,j values of the WRF grid. If i have to
>> evaluate 2m air temperature on the same I,j values will wrf_user_ij_to_ll
>> work or do I need to use some other method.
>>
>> Regards
>>
>> On Sunday, May 10, 2020, Rick Brownrigg <brownrig at ucar.edu> wrote:
>>
>>> Hi,
>>>
>>> There are at least two problems. One is that str_get_field() returns
>>> strings, and so "data" in the call to gsn_csm_contour_map() is a string,
>>> and this is the source of the error message. Try adding these 3 lines:
>>>
>>> lat := stringtofloat(lat)
>>> lon := stringtofloat(lon)
>>> data := stringtofloat(data)
>>>
>>> The other problem is that the min/max bounds are inappropriate for the
>>> data -- I get a blank plot. If I used the true min/max I get a mostly
>>> centered over Siberia:
>>>
>>> res at mpMinLatF = min(lat) ;-6.080154 ; range to zoom in on
>>> res at mpMaxLatF = max(lat) ;10.04061
>>> res at mpMinLonF = min(lon) ;95.908
>>> res at mpMaxLonF = max(lon) ;112.092
>>>
>>> Finally, the values for lat/lon in the file look suspect -- is this
>>> really a 1-degree grid? I might have guessed they are row/column values.
>>>
>>> Good luck,
>>> Rick
>>>
>>>
>>> On Sun, May 10, 2020 at 2:23 AM ali mughal via ncl-talk <
>>> ncl-talk at ucar.edu> wrote:
>>>
>>>> Dear Users
>>>>
>>>> I have csv file attached with the data available at specific grids of
>>>> the WRF outfile.Could any one help how to correct my attached code in NCL?
>>>>
>>>> When I try to run the code, I get the following error message
>>>>
>>>> (0)     This file has 4825 rows and 3 columns.
>>>> fatal:Argument type mismatch on argument (1) of (gsn_csm_contour_map)
>>>> can not coerce
>>>> fatal:["Execute.c":8578]:Execute: Error occurred at or near line 64 in
>>>> file test_1.ncl
>>>>
>>>>
>>>> Later I want to use the same code to be modified to calculate 2m air
>>>> temperature at the same I J grids.
>>>>
>>>> Regards
>>>> _______________________________________________
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>>>> ncl-talk at ucar.edu
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>>>
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