[gradsusr] Wind Arrow

[Jeff Duda]

You'll still have to use maskout(), but use 'set gxout vector' with the
'set arrowhead' and 'set arrscl' options instead.

Jeff

On Sun, Oct 19, 2014 at 10:22 PM, Olivier TRECA <otreca at me.com> wrote:

> Thank you for your answer but it’s not really what I want to do.
>
> 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 20:25, Jeff Duda <jeffduda319 at gmail.com> a écrit :
>
> 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
>>
>>
>> <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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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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