<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Tom,<div class=""><br class=""></div><div class="">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.<div class=""><br class=""></div><div class="">The arrow I want to make are like in the picture attached.</div><div class=""><br class=""></div><div class="">Do you have a method to do that ?</div><div class=""><br class=""></div><div class=""><img apple-inline="yes" id="B1EDFD26-23C3-461A-AD9F-DEDB153372D8" height="359" width="550" apple-width="yes" apple-height="yes" src="cid:4C2F9FDD-339E-4FEF-B61A-503997EE9A7F" class=""></div><div><blockquote type="cite" class=""><div class="">Le 19 oct. 2014 à 21:46, Thomas Robinson <<a href="mailto:ter@hawaii.edu" class="">ter@hawaii.edu</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Aloha Olivier, <div class=""><br class=""></div><div class="">If you use 'set gxout vector' it will plot wind vector arrows. </div><div class=""><br class=""></div><div class="">If you use </div><div class="">'set gxout vector'</div><div class="">'d u;v;mag(u,v)'</div><div class="">where u and v are your wind components, the arrows will be colored based on the wind speed. </div><div class=""><br class=""></div><div class="">If it's too dense, you can use skip to plot less arrows</div><div class="">'set gxout vector'</div><div class="">'d u;skip(v,10,10);mag(u,v)'</div><div class=""><br class=""></div><div class="">You can use cbar to see what speeds the colors match up to.</div><div class=""><br class=""></div><div class="">Good luck,</div><div class="">-Tom</div><div class=""><br class=""></div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Sun, Oct 19, 2014 at 7:25 AM, Jeff Duda <span dir="ltr" class=""><<a href="mailto:jeffduda319@gmail.com" target="_blank" class="">jeffduda319@gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">Olivier,<br class="">You'll probably want to use a combination of maskout() and <a href="http://www.iges.org/grads/gadoc/gradcomdsetstrmden.html" target="_blank" class="">set strmden</a> 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.<br class=""><br class="">Jeff Duda<br class=""></div><div class="gmail_extra"><br class=""><div class="gmail_quote"><div class=""><div class="h5">On Sun, Oct 19, 2014 at 5:11 AM, Olivier TRECA <span dir="ltr" class=""><<a href="mailto:otreca@me.com" target="_blank" class="">otreca@me.com</a>></span> wrote:<br class=""></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class=""><div class="h5"><div style="word-wrap:break-word" class="">Hello,<div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">Could see my map on this site : </div><div class=""><br class=""></div><div class=""><a href="http://www.chasseurdemigrateurs.com/meteo/view/2014/10/19" target="_blank" class="">http://www.chasseurdemigrateurs.com/meteo/view/2014/10/19</a></div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">If somebody could help me !</div><div class=""><br class=""></div><div class="">Many thanks</div><div class=""><br class=""></div><div class=""><span style="font-family:Georgia;text-align:-webkit-auto" class="">Olivier TRECA</span></div><div class=""><span style="border-collapse:separate;font-family:Georgia;border-spacing:0px" class=""><div class=""><a href="mailto:otreca@me.com" target="_blank" class="">otreca@me.com</a></div><div class=""><br class=""></div></span><br class=""><span class=""><PastedGraphic-2.tiff></span>
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<br class=""></blockquote></div><span class="HOEnZb"><font color="#888888" class=""><br class=""><br clear="all" class=""><br class="">-- <br class="">Jeff Duda<br class="">Graduate research assistant<br class="">University of Oklahoma School of Meteorology<br class="">Center for Analysis and Prediction of Storms<br class="">
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<br class=""></blockquote></div><br class=""><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="">Tom Robinson<br class="">Treasurer - Graduate Student Organization <br class="">Secretary - Student Athletic Fee Committee <br class="">Graduate Student - Department of Atmospheric Science <br class="">732-718-2323<br class=""></div>
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