<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">If you don't like the skip option, you can try 'gxout stream' -- this is a nice way to illustrate a wind field with crowded vectors. 'set strmden' controls the density of the streamlines. <DIV>Jennifer</DIV><DIV><BR><DIV><DIV>On Mar 20, 2007, at 12:38 AM, John Guhin wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite">Hi,<BR> I am trying to plot wind vectors at a certain level. Because of the high resolution of the data, there are too many vectors, and the figure becomes blurred/shaded. Using GrADS 'skip' function I could produce a readable figure. I think 'skip' function only skips gridpoints, and does not take into consideration the values at the skipped points. Is this correct? If yes, how can I produce a legible figure of wind vector, which considers all gridpoints while drawing the vector !! <BR>thanks..... <BR><BR>'open u.ctl'<BR>'open v.ctl'<BR>'set lon 140 200';'set lat -10 10';'set lev 200'<BR>'set gxout vector';'set ccolor 1';'set cthick 3' <BR>'set arrowhead 0.04';'set arrscl '0.5' '20;'set arrlab off'<BR>'d skip(ave(u,time=20apr,time=23apr),12,12);skip(ave(v.2,time=20apr,time=23apr))'<BR></BLOCKQUOTE></DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>--</DIV><DIV>Jennifer M. Adams</DIV><DIV>IGES/COLA</DIV><DIV>4041 Powder Mill Road, Suite 302</DIV><DIV>Calverton, MD 20705</DIV><DIV><A href="mailto:jma@cola.iges.org">jma@cola.iges.org</A></DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR class="Apple-interchange-newline"></SPAN></SPAN></SPAN> </DIV><BR></DIV></BODY></HTML>