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<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<span style=""></span></p>
<p class="MsoNormal"> </p>
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