Cross-equator wind barbs

Hi all,

I want to highlight an additional issue with the plotting of wind barbs
with Southern Hemisphere orientation in cross-equator plots. This message
has been on the list before, and I developed a workaround similar to the
one that was present on the list (e.g.
http://www.ncl.ucar.edu/Support/talk_archives/2010/1456.html and
http://www.ncl.ucar.edu/Support/talk_archives/2010/1299.html). However, if
one breaks the vector plots into two separate plots, vectors separated by a
vcMinDistanceF setting are present everywhere except along the equator,
where the barbs are very close and could even overlap if sufficient
meridional flow was present. In the plot below, I only plot {0:90} in the
NH and {-90:-0.5} in the SH, allowing for some separation (see link below
for example). While I could increase this separation to simulate a
vcMinDistanceF-type separation, this obviously wouldn't scale well to
various map sizes/zoom levels. Since Dave Brown mentioned that this would
be added to the to-do list nearly 2 years ago now, I was wondering if any
progress had been made, or if the language offered any better workarounds.
My attempt to set a conditional attribute (using where) was unsuccessful,
but I hope a similar solution is perhaps possible on the backend for
datasets where a latitude coordinate is available. Thanks!

http://www.atmos.albany.edu/student/kgriffin/ncl/sample_for_winds.png

Kyle
-----------------------------------------------------
Kyle S. Griffin
Dept. of Atmospheric and Environmental Sciences
University at Albany, SUNY
1400 Washington Ave, Albany, NY 12222
Office: ES-218 Email: kgriffin@atmos.albany.edu
http://www.atmos.albany.edu/student/kgriffin/

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Received on Thu Mar 15 17:22:02 2012