Re: [netcdf-java] Configuring GRIB tables in NetCDF

• To: rkambic <rkambic@xxxxxxxxxxxxxxxx>
• Subject: Re: [netcdf-java] Configuring GRIB tables in NetCDF
• From: "Tor Christian Bekkvik" <torc@xxxxxx>
• Date: Thu, 8 Oct 2009 16:02:51 +0200

Hi,
The GribPDSParamTable.addParameterUserLookup call did not seem to help 
in my case; the resulting parameter names/units reported for my gribfile 
was still not affected.
Probable cause:
The addParameterUserLookup call only applies to GRIB-1 
(ucar.grib.grib1.GribPDSParamTable), while my gribfile triggered the 
GRIB-2 parser in NetCDF (from NetcdfDataset.openDataset(grib2file);)



Questions:
-1) Could Netcdf be instructed/hinted to prefer the GRIB-1 reader, when 
possible ?  (JGRIB, a grib-1 reader, was able to read my file)

-2) Is there another way to configure GRIB tables (or parameter 
interpretation) in NetCDF which now would work for both GRIB-1 and 
GRIB-2 ?



Thanks,
-Tor C

> -----Original Message-----
> From: Robb Kambic [mailto:rkambic@xxxxxxxxxxxxxxxx] 
> Sent: 6. oktober 2009 21:02
> To: Tor Christian Bekkvik
> Cc: Gro Fonnes; netcdf-java; Kjell Røang
> Subject: Re: Configuring GRIB tables in NetCDF
> 
> On Tue, 6 Oct 2009, Tor Christian Bekkvik wrote:
> 
> > Hi, I have some questions regarding GRIB table configuration:
> >  
> > 1) Is there a way to configure GRIBtables in NetCDF without 
> rebuilding 
> > grib-6.0.jar in ncSrc-4.0.zip!\lib\release\ ?
> 
> Tor,
> 
> Yes, the following routine, in class GribPDSParamTable
> 
> /**
>     * Reads in the list of tables available and stores them.  
> Does not actually
>     * open the parameter tables files, nor store the list of 
> parameters, but
>     * just stores the file names of the parameter tables.
>     * Parameters for a table are read in when the table is 
> requested (in the
>     * getParameterTable method).
>     *
>     * @param userGribTabList string of userlookup file
>     * @throws IOException on read error
>     */
>    public static void addParameterUserLookup(String userGribTabList)
> 
> 
> There is a sample file with the grib jar called  
> userlookup.lst, it has the same syntax as tablelookup.lst.  
> If the table name begins with /, http:, or file: then it 
> looks for the file with the full path name, otherwise it 
> assumes the table is in the resource directory. The tables 
> are loaded according to site ID, subsite ID and table version 
> number that's obtained from the data file.  If you load a new 
> table with the same configuration as one in tablelookup.lst 
> file, your new configuration will over write the original 
> configuration.
> 
>              GribPDSParamTable.addParameterUserLookup(
> "/local/robb/trunk20090914/grib/resources/resources/grib/table
> s/userlookup.lst");
> 
> > 2) Where can I find sourcecode for grib-6.0.jar (or later 
> versions) ?  
> > (the source will answer question 1, but is not included in 
> > ncSrc-4.0.zip)
> >  
> 
> The source for the Grib decoder package is located on page:
> http://www.unidata.ucar.edu/software/decoders/  unders downloads.
> 
> The Grib package has just went under a major refactor to 
> implement the Ensemble data processing, so some APIs have be 
> deprecated. The deprecated APIs are going to be removed in a 
> future release so I suggest looking at the javaDocs for the changes.
> 
> RObb...
> 
> 
> 
> 
> >  
> > We occasionally have gribfiles using gribtables not defined in 
> > grib*.jar. The only solution I currently know, is to unzip the 
> > grib*.jar file and modify gribtable definitions inside 
> > \resources\grib\tables\tablelookup.lst.  (tablelookup.lst points to 
> > *.tab files in the same directory) This is not very user 
> friendly, so 
> > perhaps there is a java property or method call where you 
> can override some gribtable settings?
> >  
> >  
> >  
> > Thanks,
> > Tor C Bekkvik
> >  
> > --
> > 
> > Tor Christian Bekkvik
> > Scientist
> > Christian Michelsen Research AS
> > Phone: +47 55 57 42 28
> > 
> > 
> >
> 
> ==============================================================
> =================
> Robb Kambic                              Unidata Program Center
> Software Engineer III                    Univ. Corp for 
> Atmospheric Research
> rkambic@xxxxxxxxxxxxxxxx                 WWW: 
> http://www.unidata.ucar.edu/
> ==============================================================
> =================
> 

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