[gradsusr] Wind Arrow

[Jeff Duda]

Olivier,
You'll probably want to use a combination of maskout() and set strmden
<http://www.iges.org/grads/gadoc/gradcomdsetstrmden.html> to control the
appearance of the arrowheads on a streamline plot.  The maskout() function
will plot a set of streamlines in an area corresponding to whatever speed,
direction, or other threshold you want (sounds like you want to use speed
as a threshold), and all of the streamlines plotted will correspond to the
current 'set strmden' settings.  Between each display command you will want
to re-enter the 'set strmden' command with different settings and use
different thresholds in the maskout() function.

Jeff Duda

On Sun, Oct 19, 2014 at 5:11 AM, Olivier TRECA <otreca at me.com> wrote:

> Hello,
>
> My name is Olivier and I’m from France. I use GrADS to make the maps which
> describe the weather and the migration of the birds.
>
> Could see my map on this site :
>
> http://www.chasseurdemigrateurs.com/meteo/view/2014/10/19
>
> The wind is important but I don’t have found how to make cute arrows and
> so I use the streamlines. But I’m not happy.
>
> What I want to make is small arrows when the wind is light and big one
> filled for example in red when the wind is stronger.
>
> I think it could be possible drawing a rectangle and a triangle at the
> right place and with the right size… but I’m not aware with this type of
> manipulation.
>
> If somebody could help me !
>
> Many thanks
>
> Olivier TRECA
> otreca at me.com
>
>
>
>
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>


-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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