[gradsusr] Wind Arrow

[Olivier TRECA]

Hi Tom,

Thank you for your answer but it’s not really what I want to do. I have already tested vector but that arrow is not very nice.

The arrow I want to make are like in the picture attached.

Do you have a method to do that ?


> Le 19 oct. 2014 à 21:46, Thomas Robinson <ter at hawaii.edu> a écrit :
> 
> Aloha Olivier, 
> 
> If you use 'set gxout vector' it will plot wind vector arrows.  
> 
> If you use 
> 'set gxout vector'
> 'd u;v;mag(u,v)'
> where u and v are your wind components, the arrows will be colored based on the wind speed.  
> 
> If it's too dense, you can use skip to plot less arrows
> 'set gxout vector'
> 'd u;skip(v,10,10);mag(u,v)'
> 
> You can use cbar to see what speeds the colors match up to.
> 
> Good luck,
> -Tom
> 
> 
> On Sun, Oct 19, 2014 at 7:25 AM, Jeff Duda <jeffduda319 at gmail.com <mailto:jeffduda319 at gmail.com>> wrote:
> 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 <mailto: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 <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 <mailto:otreca at me.com>
> 
> 
> <PastedGraphic-2.tiff>
> 
> 
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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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> 
> 
> 
> -- 
> Tom Robinson
> Treasurer - Graduate Student Organization 
> Secretary - Student Athletic Fee Committee 
> Graduate Student - Department of Atmospheric Science 
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