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<p class=MsoNormal><span style='color:#1F497D'>For the archives, I'm answering
my own question as I think I got it resolved…<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The "Unknown Grib2 Index
Version Number" occurs when I download NCEPs IDX file with the GRIB2 file.
However, if I create my own IDX file using Gribmap, I don't get this error.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Additionally, the problem I was
having with cnvgrib not working without rebooting was due to cygwin1.dll being
in more than one location on the PC. Apparently you can only have 1 copy of
this on the entire PC, and make sure that it is in your system PATH.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>With all this info in hand, I
have switched to using Grib2 data directly, bypassing the need for cnvgrib,
which I think will resolve the last bit where the data is occasionally 'funky'
since an exact conversion from Grib2 to Grib1 can't really be done.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>So my process is now this:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>- DOWNLOADED GRIB2 FILE (NOT THE
IDX FILE...THAT ONE FAILED TO WORK)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>- CREATED CTL FILE BY RUNNING
G2CTL... NOTE I HAD AN ERROR WITH CYGWIN, FIXED BY MAKING SURE I ONLY HAD 1
COPY OF CYGWIN1.DLL ON THE ENTIRE MACHINE (ONE COMES WITH OPENGRADS), AND THAT
IT WAS IN THE SYSTEM PATH.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>- THEN I RAN GRIBMAP TO CREATE
THE IDX.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Andy<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
gradsusr-bounces@gradsusr.org [mailto:gradsusr-bounces@gradsusr.org] <b>On
Behalf Of </b>Andrew Revering<br>
<b>Sent:</b> Sunday, October 31, 2010 4:27 AM<br>
<b>To:</b> 'GrADS Users Forum'<br>
<b>Subject:</b> [gradsusr] GRIB2 / GRIB1 Data<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have to type this out before my brain explodes and I
forget everything….<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I'm plotting some RUC model data… <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>- When I try to create the CTL file off of a GRIB2 file
using g2ctl and display it in GrADS, GrADS gives me an
error:
"Unknown Grib2 Index Version Number"<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Ok, so I convert it to Grib1 then plot it.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>- When I convert the Ruc GRIB2 to GRIB1 using cnvgrib, I
have a hunch that it's not converting the GRIB file correctly all the time because…<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>
1) If I manually try to execute cnvgrib.exe through a cmd prompt (using
windows) it seems it will occasionally get an error that is resolved by
rebooting the computer. The error says it could be a problem with cygwin1.dll
and it also suggests rebooting… so I reboot and try again and it works.<o:p></o:p></p>
<p class=MsoNormal>
2) In my automated system that uses this Grib2->Grib1 step, some data is
good, and others are really odd… it seems like its missing data or
perhaps the data isn't even packed correctly. Other runs of data are fine.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So with all that said I guess my questions are:<o:p></o:p></p>
<p class=MsoNormal>- Why does GrADS give me the "Unknown Grib2 Index
Version Number" error if I try to load a Grib2 file, and how do I work
around that?<o:p></o:p></p>
<p class=MsoNormal>- Why would cnvgrib.exe not work without error unless I do a
reboot of the PC?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I'll also take any other ideas on how to load grib data so
it is properly read reliably.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Andrew Revering<o:p></o:p></p>
<p class=MsoNormal>Convective Development, Inc.<o:p></o:p></p>
<p class=MsoNormal>http://www.convectivedevelopment.com/<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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