<div dir="ltr">Only once</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Jan 2, 2014 at 8:29 PM, Sim D. 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">On 1/1/14, 5:23 AM, Yaqiang Wang wrote:<br>
> You should write the data following polar stereographic projection<br>
> coordinate but not LongLat coordinate. Then a PDEF line should be added<br>
> in the control file (<a href="http://www.iges.org/grads/gadoc/pdef.html" target="_blank">http://www.iges.org/grads/gadoc/pdef.html</a>).<br>
<br>
That's good information, but doesn't answer my question. Do I write the<br>
origin points once or 360 times?<br>
<br>
Thanks<br>
<br>
><br>
><br>
> On Wed, Jan 1, 2014 at 4:03 AM, sim.aberson <<a href="mailto:sim.aberson@noaa.gov">sim.aberson@noaa.gov</a><br>
> <mailto:<a href="mailto:sim.aberson@noaa.gov">sim.aberson@noaa.gov</a>>> wrote:<br>
><br>
> 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>
><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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> --<br>
> *************************************************<br>
> Dr. Yaqiang Wang<br>
> Chinese Academy of Meteorological Sciences (CAMS)<br>
> 46, Zhong-Guan-Cun South Avenue<br>
> Beijing, 100081<br>
> China<br>
><br>
> <a href="mailto:yaqiang.wang@gmail.com">yaqiang.wang@gmail.com</a> <mailto:<a href="mailto:yaqiang.wang@gmail.com">yaqiang.wang@gmail.com</a>><br>
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<br>
--<br>
One day, the wind blowed so hard, it blowed a well up out of the ground;<br>
blowed so hard, it blowed a crooked road straight. Another time it<br>
blowed an' blowed, an' scattered the days of the week so bad Sunday<br>
didn't get around 'til late Tuesday mo'nin. - The WPA Guide to Florida<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>
Beijing, 100081<br>China<br> <br><a href="mailto:yaqiang.wang@gmail.com" target="_blank">yaqiang.wang@gmail.com</a><br><br><a href="http://www.meteothinker.com" target="_blank">http://www.meteothinker.com</a><br>
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