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============================================================================== Robb Kambic Unidata Program Center Software Engineer III Univ. Corp for Atmospheric Research rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/ ============================================================================== ---------- Forwarded message ---------- Date: Mon, 1 Mar 2004 12:14:51 -0500 (EST) From: Lori Thompson <Lori.Thompson@xxxxxxxx> To: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx> Subject: Re: 20040226:valtime_offset problems gribtonc Great, I'm getting 1 frame per netcdf file now. I guess that modification is one that I did in combination with others. Thanks for all your help, Lori On Mon, 1 Mar 2004, Robb Kambic wrote:
Lori,
I received the grib file and created a cdl file for your isabel data.
The cdl from gribtocdl had to be modified a litte because it had
valtime offsets of 0 and 6 because the PRECIP var is actually a time
range and gribtocdl doesn't handle that well. ie
>From gribdump:
Time Range Indicator : Accumulation from P1 to P2
Time 1 (P1) : 0
Time 2 (P2) : 6
other vars were similar too:
Time Range Indicator : Reference Time + P1
Time 1 (P1) : 6
When gribtonc ran on the data, it only created one record for the 6 hr data.
The cdl is a attached.
Robb...
On Thu, 26 Feb 2004, Robb Kambic wrote:
> On Thu, 26 Feb 2004, Unidata Support wrote:
>
> >
> > ------- Forwarded Message
> >
> > >To: support-decoders@xxxxxxxxxxxxxxxx
> > >From: Lori Thompson <Lori.Thompson@xxxxxxxx>
> > >Subject: valtime_offset problems
> > >Organization: UCAR/Unidata
> > >Keywords: 200402261855.i1QItjrV024503
> >
> > We recently upgraded to the decoders version 3.0.2. I am converting a
> > dataset from grib to NetCDF. During the conversion, each snapshot file was
> > concatenated using nccatm to produce a time series file. I seem to be
> > running into problems with this newer version where additional points are
> > added to the record dimension during gribtonc, creating additional
> > 9actually doubling) blank frames in the time series. I have made several
> > attempts to manipulate the CDL file so that the record dimension will only
> > have 1 value per file but these efforts failed. Is there a new feature
> > with the upgrade that is causing this, or am I doing something wrong?
>
>
> Lori,
>
> I am not quite sure that what your question is?
>
> The valtime_offsets are extracted from the data files. The
> offsets must be in the raw grib data you used to make the cdl. You could
> use use the gribdump utility to check your grib input file. ie
>
> % gribdump <rawgrib> | less
> ...
> Time Range Indicator : Reference Time + Long P1
> Time 1 (P1) : 0
> Time 2 (P2) : 12
> ...
>
> This would result in a valtime_offset of 12. You could edit the cdl file
> in the data section. Removing some of the values for the
> valtime_offset, only used the offsets in the data that you are decoding.
>
> I don't know what the result would be if the variable valtime_offset was
> removed from the data section. You would get some errors but not fatal
> errors.
>
>
> If none of the above ideas work, you might want to use the old version of
> the decoder and modify the gribtocdl file section to look like lines
> 1882-1937 in the latest gribtocdl. I think that the actual changes might
> be only a couple lines in that section. A simple recompile might solve
> your problem.
>
> Let me know your findings. If you are still having problems, send me your
> cdl an a sample grib file.
>
> Robb....
>
>
> >
> > Thanks,
> > Lori
> >
> > --
> > ----------------------------------------------------
> > Lori A. Thompson
> > Applications Programmer/RS Information Systems, Inc.
> > Geophysical Fluid Dynamics Laboratory/NOAA
> > Princeton University Forrestal Campus/Route 1
> > PO Box 308
> > Princeton, NJ 08542
> > Phone: 609-452-6563
> > Fax: 609-987-5063
> > http://www.gfdl.noaa.gov/~lat
> >
> > --
> > NOTE: All email exchanges with Unidata User Support are recorded in the
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> >
> > ------- End of Forwarded Message
> >
---------------------------------------------------- Lori A. Thompson Applications Programmer/RS Information Systems, Inc. Geophysical Fluid Dynamics Laboratory/NOAA Princeton University Forrestal Campus/Route 1 PO Box 308 Princeton, NJ 08542 Phone: 609-452-6563 Fax: 609-987-5063 http://www.gfdl.noaa.gov/~lat
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