<div dir="ltr">Hi Olivier,<div><br></div><div>When you use</div><div>'set gxout vector'</div><div><br></div><div>you can use</div><div>'set arrowhead size'</div><div><br></div><div><a href="http://www.iges.org/grads/gadoc/gradcomdsetarrowhead.html">http://www.iges.org/grads/gadoc/gradcomdsetarrowhead.html</a><br></div><div><br></div><div>If 'size' is set to a negative value, the size of the arrowhead will be proportional to the wind speed.</div><div><br></div><div>Thanks,</div><div>Hui</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Oct 19, 2014 at 11:23 PM, Olivier TRECA <span dir="ltr"><<a href="mailto:otreca@me.com" target="_blank">otreca@me.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Tom,<div><br></div><div>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><br></div><div>The arrow I want to make are like in the picture attached.</div><div><br></div><div>Do you have a method to do that ?</div><div><br></div><div><img height="359" width="550" src="cid:4C2F9FDD-339E-4FEF-B61A-503997EE9A7F"></div><div><blockquote type="cite"><div>Le 19 oct. 2014 à 21:46, Thomas Robinson <<a href="mailto:ter@hawaii.edu" target="_blank">ter@hawaii.edu</a>> a écrit :</div><br><div><div dir="ltr">Aloha Olivier, <div><br></div><div>If you use 'set gxout vector' it will plot wind vector arrows. </div><div><br></div><div>If you use </div><div>'set gxout vector'</div><div>'d u;v;mag(u,v)'</div><div>where u and v are your wind components, the arrows will be colored based on the wind speed. </div><div><br></div><div>If it's too dense, you can use skip to plot less arrows</div><div>'set gxout vector'</div><div>'d u;skip(v,10,10);mag(u,v)'</div><div><br></div><div>You can use cbar to see what speeds the colors match up to.</div><div><br></div><div>Good luck,</div><div>-Tom</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Oct 19, 2014 at 7:25 AM, Jeff Duda <span dir="ltr"><<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Olivier,<br>You'll probably want to use a combination of maskout() and <a href="http://www.iges.org/grads/gadoc/gradcomdsetstrmden.html" target="_blank">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><br>Jeff Duda<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Sun, Oct 19, 2014 at 5:11 AM, Olivier TRECA <span dir="ltr"><<a href="mailto:otreca@me.com" target="_blank">otreca@me.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div style="word-wrap:break-word">Hello,<div><br></div><div>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><br></div><div>Could see my map on this site : </div><div><br></div><div><a href="http://www.chasseurdemigrateurs.com/meteo/view/2014/10/19" target="_blank">http://www.chasseurdemigrateurs.com/meteo/view/2014/10/19</a></div><div><br></div><div>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><br></div><div>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><br></div><div>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><br></div><div>If somebody could help me !</div><div><br></div><div>Many thanks</div><div><br></div><div><span style="font-family:Georgia;text-align:-webkit-auto">Olivier TRECA</span></div><div><span style="border-collapse:separate;font-family:Georgia;border-spacing:0px"><div><a href="mailto:otreca@me.com" target="_blank">otreca@me.com</a></div><div><br></div></span><br><span><PastedGraphic-2.tiff></span>
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<br></blockquote></div><span><font color="#888888"><br><br clear="all"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br>
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<br></blockquote></div><br><br clear="all"><span class="HOEnZb"><font color="#888888"><div><br></div>-- <br><div dir="ltr">Tom Robinson<br>Treasurer - Graduate Student Organization <br>Secretary - Student Athletic Fee Committee <br>Graduate Student - Department of Atmospheric Science <br><a href="tel:732-718-2323" value="+17327182323" target="_blank">732-718-2323</a><br></div>
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