Graphics issue with vcGlyphStyle = "LineArrow"

From: Kyle Griffin <kgriffin_at_nyahnyahspammersnyahnyah>
Date: Thu Jul 12 2012 - 14:19:06 MDT

Hi all...

In NCL 6.1.0-beta, there seems to be an issue with vector glyph styles
plotted as LineArrows. Specifically, wind barbs are plotted in the arrow
head when the magnitude of the vector is of sufficient magnitude. A
sufficient magnitude seems to be in excess of 10 m/s, which is the
approximate threshold where a full barb would start being plotted on wind
barbs. Barbs are only plotted in the left-right plane, regardless of the
direction of the actual arrow. Finally, the barbs only seem to appear with
LineArrows that are oriented in a direction such that their meridional
component exceeds their zonal component. I have attempted to edit these
apparent wind barbs, but the vcWindBarb resources have not had any impact
on thickness, length, spacing, or tilt that I have seen.

I have attached an example here, with reference vector with which you can
estimate the magnitude (arrows below 4 m/s are not plotted).

The bug is not present in 6.0.0 with an identical script. I haven't
attached a sample script or data because this seems to occur regardless of
the script commands or data used to make the plot. I can shrink and clean
up my script in order to provide a sample, if necessary.

Thanks for looking at this!

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@albany.edu
http://www.atmos.albany.edu/student/kgriffin/

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Received on Thu Jul 12 16:34:32 2012

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