[ncl-talk] Error- wrf model output wind plot

[Dennis Shea]

re:  " ... (similarly for v) ..."

This is not true.  Please use printVarSummary(v) and look at the dimension
sizes.

 U and V are on staggered grids. Specifically, the WRF model uses the
Arakawa C-grid.

      https://en.wikipedia.org/wiki/Arakawa_grids
====
Please read:
   https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_getvar.shtml

Try:

  u = wrf_user_getvar(a,"ua",it)   ; U component of the wind
  v = wrf_user_getvar(a,"va",it)   ; V component of the wind






On Tue, Dec 5, 2017 at 9:36 AM, Gaurav Tiwari <gaurav16 at iiserb.ac.in> wrote:

> Hi Rick,
> printVarSummary tells the given message about the variables "u" and "v"
>
>
> Variable: u
> Type: float
> Total Size: 26261400 bytes
>             6565350 values
> Number of Dimensions: 3
> Dimensions and sizes: [bottom_top | 55] x [south_north | 345] x
> [west_east_stag | 346]
> Coordinates:
> Number Of Attributes: 6
>   FieldType : 104
>   MemoryOrder : XYZ
>   description : x-wind component
>   units : m s-1
>   stagger : X
>   coordinates : XLONG_U XLAT_U XTIME
>
> (similarly for v)
>
> Although I tried what Dennis suggested me but still my concern is to
> overcome by following error
>
> fatal:Number of dimensions in parameter (1) of (gsn_csm_vector) is (3),
> (2) dimensions were expected
>
> Actually, wrf output variable U10, V10  have two dimensions and and U,V
> have three dimension, so kindly give me some idea about the above error.
>
>
> Thanks,
>
>
>
> On Mon, Dec 4, 2017 at 11:06 PM, Rick Brownrigg <brownrig at ucar.edu> wrote:
>
>> It is very difficult to tell what is wrong -- what does a printVarSummary
>> tell you about the variables "u" and "v"?
>>
>>
>>
>> On Sat, Dec 2, 2017 at 4:45 AM, Gaurav Tiwari <gaurav16 at iiserb.ac.in>
>> wrote:
>>
>>> Hi Dennis,
>>>
>>>      I done few changes what you suggested but still I am getting some
>>> error.
>>> Current error is attached below
>>>
>>> fatal:VectorFieldInitialize: dimensions of vfUDataArray and vfVDataArray
>>> are inconsistent
>>> fatal:Unable to initialize layer-Can't Create
>>> fatal:Unable to access object with id:-4
>>> fatal:Unable to access object with id:-4
>>> warning:Unable to add DataItem "(null)" to DataList "vcVectorFieldData"
>>> fatal:CompileDataList:DataList has no valid members
>>>
>>>
>>>
>>> Kindly let me know some ideas to plot wrf wind at different different
>>> pressure levels.
>>>
>>>
>>> -Gaurav
>>>
>>>
>>>
>>>
>>> ********************************************************************
>>> *Gaurav Tiwari*
>>> Research Scholar
>>> Department of Earth and Environmental Sciences
>>> Indian Institute of Science Education and Research Bhopal
>>> (IISER B)
>>> Bhopal- 462066, Madhya Pradesh
>>> Mob: +91-7471112407 <+91%2074711%2012407>
>>> LinkedIn
>>> <https://www.linkedin.com/in/gaurav-tiwari-bb36357a?trk=hp-identity-name>
>>> Research gate <https://www.researchgate.net/profile/Gaurav_Tiwari5>
>>>
>>>
>>> On Tue, Nov 28, 2017 at 9:13 PM, Dennis Shea <shea at ucar.edu> wrote:
>>>
>>>>
>>>> u10 = wrf_user_getvar(f, "U10",it)
>>>>  printVarSummary(u10)    ; ===> [south_north | ?] x [west_east | ?]
>>>>
>>>>
>>>> ---
>>>> u = wrf_user_getvar(f, "U",it)
>>>> printVarSummary(u)    ; ===>  [bottom_top | ?] x [south_north | ?] x
>>>> [west_east_stag | ?]
>>>>
>>>> ---
>>>>
>>>> function gsn_csm_vector (
>>>> 		wks  [1] : graphic,
>>>> 		u [*][*] : numeric,  <=== 2-dimensions
>>>> 		v [*][*] : numeric,  <=== 2-dimensions
>>>> 		res  [1] : logical
>>>> 	)
>>>>
>>>> kl = 5
>>>> vector = gsn_csm_vector(wks,u(kl,:,:),v(kl,:,:),vec_res)
>>>>
>>>> On Mon, Nov 27, 2017 at 11:09 PM, Gaurav Tiwari <gaurav16 at iiserb.ac.in>
>>>> wrote:
>>>>
>>>>> Dear Mary,
>>>>>
>>>>>      I am trying to plot WRF model output wind at different different
>>>>> atmospheric pressure levels, but I am facing an error
>>>>>
>>>>> atal:Number of dimensions in parameter (1) of (gsn_csm_vector) is (3),
>>>>> (2) dimensions were expected
>>>>> fatal:["Execute.c":8640]:Execute: Error occurred at or near line 42
>>>>> in file Zwind.ncl
>>>>>
>>>>>
>>>>> The same script is working for U10, V10 but not for U,V.
>>>>>
>>>>>
>>>>> --Gaurav
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> ncl-talk at ucar.edu
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>>>>>
>>>>
>>>
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>>
>
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