Mason,<br>There is a good example of how to code temperature advection in the page for the cdiff command: <a href="http://www.iges.org/grads/gadoc/gradfunccdiff.html">http://www.iges.org/grads/gadoc/gradfunccdiff.html</a><br>
The reason for all of the crazy manipulations is because the data points on your grid are not uniformly spaced on the globe.� Thus corrections have to be made to get the correct distance between individual grid points.<br>
<br>Jeff<br><br><div class="gmail_quote">On Thu, Nov 10, 2011 at 11:00 AM, Wesley Ebisuzaki <span dir="ltr"><<a href="mailto:Wesley.Ebisuzaki@noaa.gov">Wesley.Ebisuzaki@noaa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Mason,<br>
<br>
I think that you've discovered the "private" commands used by nomads<br>
plot software for defining new variables<br>
and custom plots. � The nomads plot package is a wrapper for GrADS. �It<br>
has the ability to run grads .gs files that<br>
are embedded within the ctl files.<br>
<br>
<br>
<a href="http://www.cpc.ncep.noaa.gov/products/wesley/ncep_data/plot_doc.htmlhttp://www.cpc.ncep.noaa.gov/products/wesley/ncep_data/plot_doc.html" target="_blank">http://www.cpc.ncep.noaa.gov/products/wesley/ncep_data/plot_doc.htmlhttp://www.cpc.ncep.noaa.gov/products/wesley/ncep_data/plot_doc.html</a><br>
<br>
Ask NCDC for a copy of the .gs files.<br>
<div class="im"><br>
> Has anyone done this before with grads?<br>
</div>How do you expect the developers to debug the scripts?<br>
<font color="#888888"><br>
� � Wesley<br>
</font><div><div></div><div class="h5"><br>
<br>
<br>
Rowell, Mason D. wrote:<br>
> All,<br>
><br>
> I noticed ample comments toward the end of the ctl files available on the nomads servers from the NARR page, with a description of how to implement these in grads scripting. I tried to take this to plot temperature advection but it didn't work, b/c the last line of the comments calls for some function never provided. Has anyone done this before with grads?<br>
><br>
> Mason<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Grad student - PhD, Meteorology<br>University of Oklahoma School of Meteorology - Center for Analysis and Prediction of Storms<br><br>