Oh, I misread the value. My mistake. The mask should be uogrddsl+98 instead. You can read the documentation on the maskout function (<a href="http://www.iges.org/grads/gadoc/gradfuncmaskout.html">http://www.iges.org/grads/gadoc/gradfuncmaskout.html</a>) for a full description of how the function works.<br>
<br>Jeff<br><br><div class="gmail_quote">On Wed, Jan 23, 2013 at 12:01 PM, Brian Walsh <span dir="ltr"><<a href="mailto:brianw@provair.com" target="_blank">brianw@provair.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-CA">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Jeff,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">It doesn’t appear that worked. Where does the 98-uogrddsl come from?</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Brian</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" lang="EN-US">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" lang="EN-US"> <a href="mailto:gradsusr-bounces@gradsusr.org" target="_blank">gradsusr-bounces@gradsusr.org</a> [mailto:<a href="mailto:gradsusr-bounces@gradsusr.org" target="_blank">gradsusr-bounces@gradsusr.org</a>]
<b>On Behalf Of </b>Jeff Duda<br>
<b>Sent:</b> January-23-13 2:19 PM<br>
<b>To:</b> GrADS Users Forum<br>
<b>Subject:</b> Re: [gradsusr] Omit Missing Values</span></p><div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Brian,<br>
Use the maskout function.<br>
'define ucurrent = maskout(uogrdds,98-uogrdds)'<br>
'define vcurrent = maskout(vogrdds,98-vogrdds)'<br>
'e = mag(ucurrent,vcurrent)'<br>
'd e'<br>
<br>
I think that should work. Let me know if it doesn't.<br>
<br>
Jeff Duda</p>
<div>
<p class="MsoNormal">On Wed, Jan 23, 2013 at 11:32 AM, Brian Walsh <<a href="mailto:brianw@provair.com" target="_blank">brianw@provair.com</a>> wrote:</p>
<div>
<div>
<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’m plotting ocean currents and the grib file contains values of -99 for grid points near land. So, when I try to plot the combined current speed/direction (u, v), it has values very high near and over land. I can use basemap to
cover the land, but there are grid points near land and over water that are still showing (see attached sample image where red is the extreme/missing values).
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I think the const command is what I need, but I’m not sure how to set this up when I want to combine the u, v parameters. I tried:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> 'define ucurrent=const(uogrddsl, -99, -u)'</p>
<p class="MsoNormal"> 'define vcurrent=const(vogrddsl, -99, -u)'</p>
<p class="MsoNormal"> 'e=mag('ucurrent','vcurrent')'</p>
<p class="MsoNormal"> 'd e'</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">But, no luck. Any ideas?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Brian</p>
<p class="MsoNormal"> </p>
</div>
<p class="MsoNormal"> <br>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
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<p class="MsoNormal"><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</p>
</div></div></div><div><div class="h5">
<br>
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<br></blockquote></div><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>