Re: 20050707: netCDF Decoders - Degribbing files

• To: Brandon Nelson <nelsonb@xxxxxxxxxxx>
• Subject: Re: 20050707: netCDF Decoders - Degribbing files
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Thu, 7 Jul 2005 14:10:52 -0600 (MDT)

On Thu, 7 Jul 2005, Unidata Support wrote:

>
> ------- Forwarded Message
>
> >To: support-decoders@xxxxxxxxxxxxxxxx
> >From: "Brandon Nelson" <nelsonb@xxxxxxxxxxx>
> >Subject: netCDF Decoders - Degribbing files
> >Organization: Air Force Weather Agency
> >Keywords: 200507071800.j67I0wA2001404 netCDF decoders
>
> Institution: USAF HQ AFWA/SCSA
> Package Version: unknown
> Operating System: Windows XP Pro
> Hardware Information: unknown
> Inquiry: We are trying to figure out how to use your java classes to 
> degrib several files.  Do you have a quick example to lead us in the 
> right direction? We are using the ucar.grib.grib1 files.
> Thank you for your time.
>

Brandon,

After setting your CLASSPATH to find the the jar files. in the run file
there are samples like.


java -Xmx256m ucar/grib/grib1/Grib1Dump data/RUC.wmo | more

java -Xmx256m ucar/grib/grib1/Grib1Indexer data/RUC.wmo | more

in the IndexFormat.txt file it explains the index format. the index is
used for quick data extraction.

java -Xmx256m ucar/grib/grib1/Grib1GetData data/RUC.wmo 110 1 true | more

the "110 1 true" are the BmsOrGdsOffset DecScale BmsExists fields from the
index file. This permits the data extractor to position itself in file to
get the data and to scale it correctly.

the data/RUC.wmo is a locate test file, you can use any grib1 file for
your tests.

the grib.jar package will also decode grib2 files.


please note:

the source code is still in beta development so any bugs that you find
would be helpfull to me to know about. there are some extra files in
the tar, don't be concerned about them. the code is GribJava.tar.gz and it
is located at:

% ftp www.unidata.ucar.edu
% cd pub/decoders
% get GribJava.tar.gz

i just made a new file today with the latest changes.


robb...


> V/r
> Brandon K. Nelson, A1C USAF
> Communications/Computer Systems Programmer
> Air Force Weather Agency
> (402) 232-0159
> nelsonb@xxxxxxxxxxx
>
>
>
> --
> NOTE: All email exchanges with Unidata User Support are recorded in the
> Unidata inquiry tracking system and then made publicly available
> through the web.  If you do not want to have your interactions made
> available in this way, you must let us know in each email you send to us.
>
> ------- End of Forwarded Message
>

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