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Re: grib=>nc time axis problem (fwd)


===============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
===============================================================================

---------- Forwarded message ----------
Date: Fri, 19 Mar 2004 12:51:41 -0500 (EST)
From: Lori Thompson <address@hidden>
To: Robb Kambic <address@hidden>
Subject: Re: grib=>nc time axis problem

Thanks, Rob. I added the time series to the final concatenated file and
the took care of the additional record frames.

On Fri, 19 Mar 2004, Robb Kambic wrote:

> On Thu, 18 Mar 2004, Lori Thompson wrote:
>
> > Hi Robb. I wrote to you a couple weeks ago regarding a conversion from
> > grib to nc data. During the conversion using gribtocdl and gribtonc, I
> > received an additional record dimension which contained blank data. As a
> > solution, after gribtocdl, I edit the cdl file and change valtime_offset
> > in the dimensions section equal to 1 rather than 2 and in the data
> > section, change valtime_offset from 0, model_time to model_time. This
>
> Lori,
>
> My solution to this is in this msg:
>
> http://www.unidata.ucar.edu/cgi-bin/msgout?/glimpse/decoders/627
>
> > resulted in 1 record frame for the time series. However, the concatenated
> > time series file does not contain a time axis. I tried to edit the cdl
> > file by replacing record with time, add the time variable with the
> > metadata, and add the time under the data section equal to the model time.
>
> I would edit the cdl by setting the dimension "valtime_offset" to the
> number of hours in the time series. In the data section set the variable
> "valtime_offset" to the actual hours in the time series. ie
>
> valtime_offset = 84, 96, 108, 132, 144, 120, 192, 240 ;
>
> This is how the ldm pqact is set up to decode the model files resulting
> with one record per hour. Hopefully this solves your problem.
>
> Robb..
>
> > However, this is producing 2 frames for each file again when it is only
> > supposed to be one. I tried to remove the valtime and reftime variables
> > and am getting a bus error. There seems to be more time variables with
> > this newest version of the decoders and I'm not sure which ones are to be
> > retained. Instead of editing the cdl file, can I add a time axis and
> > metadata to the singe time series resultant file, since this one produces
> > the correct amount of frames?
> >
> > Thanks in advance for your help.
> > 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
> >
>
> ===============================================================================
> Robb Kambic                              Unidata Program Center
> Software Engineer III                    Univ. Corp for Atmospheric Research
> address@hidden                   WWW: http://www.unidata.ucar.edu/
> ===============================================================================
>

-- 
----------------------------------------------------
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