[ncl-talk] Wind Barbs cross equator issue

[Dennis Shea]

Hello

*This is offline.*

Certainly for grids where there are conventional latitude and longitude
coordinate variables [ eg: lat(lat), lon(lon) ]

(
https://www.unidata.ucar.edu/software/netcdf/workshops/2011/datamodels/NcCVars.html
and

https://www.unidata.ucar.edu/software/netcdf/docs/netcdf_data_set_components.html
),

the wind barbs follow conventions.

See the 1st few figures at:   https://www.ncl.ucar.edu/
Applications/barb.shtml <https://www.ncl.ucar.edu/Applications/barb.shtml>

--
Also, see attached png file which was created from a regional rectilinear
grid.
This follows the wind barb convention.

--

Can you please follow the instructions at:
*https://www.ncl.ucar.edu/ftp_files.shtml
<https://www.ncl.ucar.edu/ftp_files.shtml>*

ftp ftp.cgd.ucar.edu
anonymous*jerry_leo at msn.com <http://msn.com>                  <enter
your email address for the password>*
cd incoming
put *file1*
put *file2*
. . .*continue with 'put' commands until all desired files are uploaded*. . .
quit

When the upload is complete, send email to ncl-talk <ncl-talk at ucar.edu> or
the NCL team member that you've already been working with and include the
exact names of the files, and the approximate size of each file.

For security reasons, you cannot list the contents of the 'incoming'
directory. This is why we need to know the exact names of the files.

THX

On Thu, Jun 7, 2018 at 1:02 AM, Jianyu Liu <jerry_leo at msn.com> wrote:

> Hi,
>
>
> I'm using NCL 6.3.0,  just noticed there was an issue for the Wind Barbs
> cross equator that gsn_csm_vector does not currently automatically change
> the wind barb tick position to account for the conventional difference
> for north and south of the equator.
>
>
> I knew it could manually change the resource vcWindBarbTickAngleF to a
> negative value to get wind barbs that conform to the southern hemisphere
> convention, but this does not help for plots that cross the equator where
> both conventions are needed.   Please see the attachment for the example.
>
>
> Here are my settings for the Wind Barbs
>
>
>   opts at gsnLeftStringFontHeightF  = 0
>   opts at gsnRightStringFontHeightF = 0
>   opts at vcRefMagnitudeF           = 10.0             ; define vector ref
> mag
>   opts at vcRefLengthF              = 0.030           ; define length of vec
> ref
>   opts at vcGlyphStyle              = "WindBarb"         ; select wind barbs
>   opts at vcMinDistanceF            = 0.02              ; thin out windbarbs
>   opts at vcVectorDrawOrder         = "PostDraw"
>   opts at vcRefAnnoOrthogonalPosF   = -1.08
>
> Wondering if I'm missing certain settings or what's the workaround for
> this sort of issue ?
>
>
> Thanks for your time
>
>
> Regards
>
>
> Jerry
>
>
>
>
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