<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="">Thank you for your answer but it’s not really what I want to do.<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=""><br class=""><div><blockquote type="cite" class=""><div class="">Le 19 oct. 2014 à 20:25, Jeff Duda <<a href="mailto:jeffduda319@gmail.com" class="">jeffduda319@gmail.com</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><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" 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">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=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><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><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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