RE: Grib File

• To: Nelson Brandon K A1C AFWA/SCSA <brandon.nelson@xxxxxxxxxxx>
• Subject: RE: Grib File
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Mon, 18 Jul 2005 11:10:27 -0600 (MDT)

Brandon,

after viewing the data, i discovered many missing parameters. i couldn't
find these on the web, do you know a location for a table?  or do you know
the name, short desc, long desc, and units for the following parameter
numbers.

134-137, 140-143, 145-149, 151, 152 155 157, 161, 163, 165-171, 191-194,
197, 199, 208, 209, 220-223, 227, 228, 230-239, 241, 246, 248-254

robb...





On Mon, 18 Jul 2005, Robb Kambic wrote:

> On Mon, 18 Jul 2005, Nelson Brandon K A1C AFWA/SCSA wrote:
>
> > It works!  Thanks so much for your time Robb!  I am going to poke around in
> > the Java files but could you get me a pointer (excuse the programming pun)
> > in the right direction as how to pull out specific parameters from a grib
> > file?  Thanks again!
>
>
> Brandon,
>
> you need to look at the index file, file ending with gbx. there a
> explanation of the fields, etc in the IndexFormat.txt file in the root dir
> of the distribution.   the important fields are: BmsOrGdsOffset
> DecScale BmsExists.  the last 4 fields on the product line ignoring the -1
> field.  for instance product line:
>
> 1 0 -1 11 107 0 255 0 2005-07-07T00:00:00Z 0 3495848078 46890 70206 1
> false
>
> then the Grib1GetData will grab the data:
> java -Xmx256m ucar/grib/grib1/Grib1GetData data/us057g1010t04a000000000
> 46890 1 false
>
> will return the temperature data in K.   the product name is from the 11
> the 4th field from the table gwc_2.tab.
>
> that's the hard way to extract the data.
>
> we have a webstart program called netcdf tools at:
> http://my.unidata.ucar.edu/content/software/netcdf-java/v2.2/webstart/index.html
>
> a quick way to view the data would be to click the viewer tab and then
> open the folder tab ( on the right side ) to select the data set to open.
> this tools works with netcdf, grib, and other types of data. there's even
> grid viewer if you select the grids tab, then open the dataset. there's a
> red icon on the right to select. the tools program is a test program we
> use, it's not really a product.
>
> robb...
>
> >
> > -----Original Message-----
> > From: Robb Kambic [mailto:rkambic@xxxxxxxxxxxxxxxx]
> > Sent: Friday, July 15, 2005 4:45 PM
> > To: Nelson Brandon K A1C AFWA/SCSA
> > Cc: decoders; support-thredds
> > Subject: RE: Grib File
> >
> > Brandon,
> >
> > are you sure you got the latest GribJava.tar.gz? the latest is:
> > 711461 Jul 11 14:12 GribJava.tar.gz
> >
> > i ran the following w/o any exceptions thrown.
> >
> > % java -Xmx256m ucar/grib/GribChecker data/us057g1010t04a000000000
> > % java -Xmx256m ucar/grib/grib1/Grib1Dump data/us057g1010t04a000000000 |
> > more
> > % java -Xmx256m ucar/grib/grib1/Grib1Indexer data/us057g1010t04a000000000
> > | more
> >
> > remember the CLASSPATH must be set to find the grib.jar, jpeg2000.jar, and
> > junit.jar.  if you still get exception let me know.
> >
> > robb...
> >

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

• References:
  • RE: Grib File
    • From: Robb Kambic