[ncl-talk] Wind_vector_query

Kunal Bali kunal.bali9 at gmail.com
Fri Jun 24 21:46:35 MDT 2016

```Dar Griffin

Thank You so much for providing this valuable information.

Regards
Kunal Bali

On Fri, Jun 24, 2016 at 6:16 PM, Kyle Griffin <ksgriffin2 at wisc.edu> wrote:

> Kunal,
>
> The plot function you reference is labeled **vector**, thus it plots a
> vector. The i (or x, or longitude) direction is independent from the j (or
> y, or latitude) direction. The two combine in each of their directions to
> make a vector, as a gsn_csm_vector plot would be expected to do. The
> function is defined such that the first variable given is in the i
> direction, and the second variable is in the j direction. So yes, changing
> the ordering of the variables your provide the function is effectively
> rotating your grid, and yes, that changes the direction of your vectors.
>
> NCL has separate functions for wind speed and wind direction, if that is
> all you are looking for. Neither of those quantities are vectors, however,
> and would be best plotted by a regular gsn_csm_contour plot.
>
>
> Kyle
>
> On Fri, Jun 24, 2016 at 12:06 AM Kunal Bali <kunal.bali9 at gmail.com> wrote:
>
>> The resultant vector basically represents the equation
>>  sqrt [(U-wind)2  + (V-wind)2]
>>
>>
>> So if we use the function
>>
>> Plot = gsn_csm_vector_map(wks,u,v,res)
>>
>> Is that mean it is providing resultant wind plot or resultant wind
>> direction with wind speed.
>>
>> If it is providing resultant wind plot, then using code (wks, v,u, res)
>> instead of (wks, u, v, res). It is plotting different wind plot.
>>
>>
>> If the code
>> Plot = gsn_csm_vector_map(wks,u,v,res) plotting resultant wind vector
>> using equation  sqrt [(U-wind)2  + (V-wind)2], Then it should plot the
>> same resut in both the cases (wks, u,v, res) and (wks, v,u, res). Right ?
>>
>> please provide some information on that.
>>
>>
>>
>>
>> Kunal Bali
>> Research Scholar
>> Radio & Atmospheric Science Division
>> CSIR - National Physical Laboratory
>> New Delhi - 110012
>> India
>>
>>
>>
>>
>>
>> On Fri, Jun 24, 2016 at 9:50 AM, Kunal Bali <kunal.bali9 at gmail.com>
>> wrote:
>>
>>> I could not understand, what to use
>>>
>>>
>>>
>>> Kunal Bali
>>> Research Scholar
>>> Radio & Atmospheric Science Division
>>> CSIR - National Physical Laboratory
>>> New Delhi - 110012
>>> India
>>>
>>>
>>>
>>>
>>>
>>> On Thu, Jun 23, 2016 at 9:54 PM, Dennis Shea <shea at ucar.edu> wrote:
>>>
>>>> The function plots the resultant vector.
>>>>
>>>>
>>>> http://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_csm_vector_map.shtml
>>>>
>>>> On Sat, Jun 18, 2016 at 8:31 AM, Kunal Bali <kunal.bali9 at gmail.com>
>>>> wrote:
>>>>
>>>>> Dear NCL users
>>>>>
>>>>> Please correct me. The code given below is just for potting wind
>>>>> directions but not far resultant vector.
>>>>>
>>>>> Plot = gsn_csm_vector_map(wks,u,v,res)
>>>>>
>>>>> It will provide only zonal wind direction. If we modify above code
>>>>> with  (wks,v,u,res) ‎then it will provide the meridional wind direction.
>>>>>
>>>>> So if I want to plot the resultant vector of u and v then what should
>>>>> I do?
>>>>>
>>>>> Regards
>>>>> Kunal bali
>>>>>
>>>>> _______________________________________________
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>>>>> ncl-talk at ucar.edu
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>>>>>
>>>>>
>>>>
>>>
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>
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