[ncl-talk] Strange Vector Behavior

[Rashed Mahmood]

Hi Barry,
I have not used WRF routines so I am not sure if the following would work,
however, if you want to thin your vectors it is better to use the resource
" *vcMinDistanceF*", you might need to play with it a bit to get the
desired look.
See description here:
https://www.ncl.ucar.edu/Document/Graphics/Resources/vc.shtml

Cheers,
Rashed




On Thu, May 28, 2020 at 5:30 AM Barry Lynn via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Hello:
>
> I left out the text.
>
> Before copying it, I have to mention that the cross-section is an excerpt
> from the entire domain. But, radar, etc, and temperature (not shown)
> contour correctly.  That is, temperature maps correctly.
>
> The excerpted winds seem to be mapping to just 1/4 of the domain.
>
> Hello:
>
> I am making vertical cross-sections.
>
> I wanted to map vectors onto the map, but when I thin the data to plot
> fewer vectors I  end up with the vectors going 1/4 of the way across,
> rather than just getting a thinner plotting of the vector data.
>
> The full vector plotting is without the "::4."  WIth the ::4, I get just
> 1/4 of the cross-section covered.
>
> These lines cause the problem.
>
>         plot_a   = gsn_vector(wks,u_plane_a
> (0:zmax_pos,::4),v_plane_a(0:zmax_pos,::4),vecres)
>
>         plot_b   =
> gsn_vector(wks,u_plane_b(0:zmax_pos,::4),v_plane_b(0:zmax_pos,::4),vecres)
>
>         plot_c   =
> gsn_vector(wks,u_plane_c(0:zmax_pos,::4),v_plane_c(0:zmax_pos,::4),vecres)
>
>
> I have attached the code.  I am not sure why this doesn't work, since it
> generally works as advertised.  One comment: I am subsetting the u,v data
> before plotting it.
>
>
> Code attached.  Sorry it's so long!
>
> On Thu, May 28, 2020 at 2:00 PM Barry Lynn <barry.h.lynn at gmail.com> wrote:
>
>>
>>
>> --
>> Barry H. Lynn, Ph.D
>> Senior Associate Scientist, Lecturer,
>> The Institute of the Earth Science,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> C.E.O, Weather It Is, LTD
>> Weather and Climate Focus
>> http://weather-it-is.com
>> Jerusalem, Israel
>> Local: 02 930 9525
>> Cell: 054 7 231 170
>> Int-IS: x972 2 930 9525
>>
>>
>
> --
> Barry H. Lynn, Ph.D
> Senior Associate Scientist, Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
>
> _______________________________________________
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