Mike-
It's unwanted, but as HP notes, expected behavior. This is a bug so
please report to support-idv@xxxxxxxxxxxxxxxx. Hopefully, they will be
able to put this on a high priority as a fix (although the developers
are at a conference this week). The problem is that the zoom factor is
not taken into account when the barbs are first drawn. A similar
problem was encountered with the point obs display, and the solution is
to account for the zoom factor when calculating the scale that the user
has chosen.
Don
On 1/23/11 9:42 AM, Mike Hardiman wrote:
Hi all,
I'm fairly new to IDV, so please bear with me if this is an overly-basic
question.
When loading up a gridded dataset (in this case NARR data in grib
format), and plotting "truewindvectors" with wind barbs, the barbs are
overly-large...even when setting them to the smallest size (1).
What appears to be happening is the barb size is determined based on
being fully "zoomed out" on a particular projection. In this case, I had
chosen "North America" ... then zoomed in on the Southwestern CONUS and
Northwest Mexico.
When zooming in, rather than the wind barb plots growing denser and
maintaining their size... the barbs simply become larger on the display,
and cannot be made any smaller.
Is this the intended behavior in IDV? If so, it would be nice to have
the option of making barbs smaller.
I realize I can get smaller barbs if I choose a different projection --
such as "Southwest US" --- but then I get the outline of the 3D box
cutting up the middle of New Mexico.
Thanks for any guidance,
-Mike Hardiman
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--
Don Murray
NOAA/ESRL/PSD and CIRES
303-497-3596
http://www.esrl.noaa.gov/psd/people/don.murray/
