[ncl-talk] About Hodograph

[Adam Phillips]

Hi Soares,
The error message:
fatal:["Execute.c":5900]:variable (time) is not in file (infile)
is telling you exactly what the issue is. By examining your input WRF file
you can see that a variable time is not present, but a variable names Times
is. The error message is coming from this line:
time = infile->time

However, note that you do not need to exactly follow the example coding
Amadou pointed you to. You do not necessarily need to read in time, or
wind_speed and wind_direction. (Your file doesn't have those three
variables anyway.) All you should be doing is reading in the winds at the
level you are interested in (either U10/V10  or U/V), choose the grid point
you are interested in, and pass the wind speed and direction to the
 create_one_station_plot function.

wrf_ll_to_ij might be useful to find the nearest coordinate indexes to a
desired latitude and longitude:
http://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_ll_to_ij.shtml

a list of all WRF functions available in NCL is also given here:
http://www.ncl.ucar.edu/Document/Functions/wrf.shtml

Hope that all helps. If after modifying your script as detailed above you
still have questions about how to read in and subset your WRF data I highly
advise you to look at the online documention including the WRF online NCL
tutorial and the NCL website:
http://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/NCL_examples.htm
http://www.ncl.ucar.edu/Applications/wrf.shtml

Adam






On Sun, Nov 8, 2015 at 7:03 PM, isakhar sakhar isakhar <
isakhar.inside13 at gmail.com> wrote:

> Dear Mr. Adam and Mr.Amadou
>
> I just downloaded the file as you recommend and made some change according
> to my configuration. But after running the simulation, I get error says
> "fatal:["Execute.c":5900]:variable (time) is not in file (infile)
> ".
>
> Now I don't have any station (weather station), just a computer for
> running simulation only because I see there are 5 stations inside the
> script.
>
> Here I attach my two files, one is my hodograph modification and one is my
> ncdump file.
> Please take a look of these files.
>
> Regards,
> Soares
>
> On Fri, Nov 6, 2015 at 4:11 PM, Adam Phillips <asphilli at ucar.edu> wrote:
>
>> Hi Soares,
>> It looks to me like all you attached are functions. I do not see a script
>> that calls the hodograph function for instance. You need to call hodograph
>> from another NCL script, passing in the workstation, an array of the wind
>> speed, an array of the direction, and a resource list.
>>
>> For an example of how to do this, refer to a ncl-talk question from a
>> couple weeks back:
>> http://mailman.ucar.edu/pipermail/ncl-talk/2015-October/004199.html
>>
>> And see the second attachment on that page:
>>
>> http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20151022/9bdf6ef5/attachment.obj
>>
>> Coincidentally, this script holds a function that creates a hodograph
>> (named create_one_station_plot), and that function is called at the
>> bottom of the main script.
>>
>> Note that you do not have to use the ncl-talk script to do what you want.
>> This just provides an example where someone was creating hodographs by
>> calling a function external to the main script.
>>
>> Finally, no, at present there are not any hodograph examples on the NCL
>> website.
>>
>> Hope that helps. If not, or if you have any further questions, please
>> respond to the ncl-talk email list.
>> Adam
>>
>>
>>
>>
>>
>> On Fri, Nov 6, 2015 at 12:07 AM, isakhar sakhar isakhar <
>> isakhar.inside13 at gmail.com> wrote:
>>
>>> Dear NCL Talk Team
>>>
>>> I want to plot Hodograph by using 2 files in attahment but I did not see
>>> anything, no plotting.
>>>
>>> I tried also to find hodograph in website "
>>> https://www.ncl.ucar.edu/Applications/ " but I could not see it.
>>>
>>> Can someone help me how to plot wind speed and direction in Hodographs?
>>>
>>> Thank you,
>>> Soares
>>>
>>> _______________________________________________
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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>
>>
>
>


-- 
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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