Re: GRIB 1 or 2

Hi Juerg,

It is on the to-do list to add a "file type" line to the output of
printing an NioFile object.
For now, you can distinguish between GRIB 1 and GRIB 2 by the
presence or absence
of several of the data variable attributes.

GRIB 2 data variables (as opposed to coordinate variables) always
have the following
attributes that GRIB 1 data variables do not have:

production_status
parameter_discipline_and_category
parameter_template_discipline_category_number

I think this would be the most obvious difference that could be
relied on programmatically.

It is certainly possible that a script using Nio could be coded to
recognize certain GRIB 1 variable
names for instance, but fail to recognize GRIB 2 variable names for
equivalent data files.
  -dave

On Oct 17, 2007, at 4:04 PM, Juerg Schmidli wrote:

> Hi
>
> I'm using Nio to read GRIB files. How can I determine wether the files
> are in GRIB 1 or GRIB 2 format? How different are the two GRIB
> formats?
> Is it possible that a program expecting GRIB 1 can read GRIB 2, but
> interprets it not correctly?
>
> Thanks,
> Juerg
> _______________________________________________
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> pyngl-talk_at_ucar.edu
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Received on Wed Oct 17 2007 - 17:31:25 MDT