<div dir="ltr">You should write the data following polar stereographic projection coordinate but not LongLat coordinate. Then a PDEF line should be added in the control file (<a href="http://www.iges.org/grads/gadoc/pdef.html">http://www.iges.org/grads/gadoc/pdef.html</a>).</div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Jan 1, 2014 at 4:03 AM, sim.aberson <span dir="ltr"><<a href="mailto:sim.aberson@noaa.gov" target="_blank">sim.aberson@noaa.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have written fortran code to output fields on a south polar<br>
stereographic grid. When I plot, the values seem to drift from their<br>
correct location as I get further into my file, so I am doing something<br>
wrong. My control file has:<br>
<br>
XDEF 360 LINEAR -180.000 1.000000<br>
YDEF 300 LINEAR -90.000 0.009009<br>
<br>
When I write the file, do I write the 360 points at -90 latitude (even<br>
though they are all the same value), or is GrADS just expecting one<br>
value there, followed by the 360 points for the next latitude. I am<br>
doing the former, but if GrADS is expecting the latter, that could<br>
account for the drift.<br>
<br>
I could not find this information in the online documentation.<br>
<br>
Thanks<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Sim Aberson AOML/Hurricane Research Division Miami, FL<br>
"Hurricane states erect statues in my honor." -- David Sedaris<br>
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</font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br>*************************************************<br>Dr. Yaqiang Wang<br>Chinese Academy of Meteorological Sciences (CAMS)<br>46, Zhong-Guan-Cun South Avenue<br>
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