Re: [netcdfgroup] How to read grib2 files using Netcdf Java API?

org.wdssii.ncingest.Grib2Ingest is my application i.e. the class that has
the line of code that calls NetcdfDataSet.open()

Lak

On Tue, Jan 20, 2009 at 4:23 PM, John Caron <caron@xxxxxxxxxxxxxxxx> wrote:

> Hi Lak:
>
> You have a strange class: "org.wdssii.ncingest.Grib2Ingest" where does
> that come from ?
>
>
>
> Valliappa Lakshmanan wrote:
> > John,
> >
> > I downloaded the latest netcdf-4.0.jar and tried it.  I still get the
> > same problem.  Here's the stacktrace, in case the line numbers help
> > isolate the issue:
> >
> >     [java] 2009-01-20 14:26:46,867 [main] WARN
> > org.wdssii.ncingest.Grib2Ingest - java.io.IOException: Cant read
> > /scratch2/lakshman/modelmining/WRFPRS_GrbF21.grib2: not a valid NetCDF
> file.
> >      [java]     at ucar.nc2.NetcdfFile.open(NetcdfFile.java:628)
> >      [java]     at ucar.nc2.NetcdfFile.open(NetcdfFile.java:335)
> >      [java]     at ucar.nc2.NetcdfFile.open(NetcdfFile.java:305)
> >      [java]     at ucar.nc2.NetcdfFile.open(NetcdfFile.java:292)
> >      [java]     at ucar.nc2.NetcdfFile.open(NetcdfFile.java:280)
> >
> > The code that throws the exception is simply:
> >      NetcdfDataset.open("/scratch2/..../filename.grib2");
> >
> > My classpath consists of the following jar files (netcdf dependencies in
> > bold):
> >
> > commons-logging.jar
> > *jdom_1.1.jar*
> > jnotify-0.91.jar
> > jstl.jar
> > junit.jar
> > *log4j-1.2.14.jar*
> > *netcdf-4.0.jar*
> > servlet-api.jar
> > *slf4j-api-1.1.0.jar
> > slf4j-log4j12-1.1.0.jar*
> > spring.jar
> > standard.jar
> >
> > thanks
> > Lak
> >
> >
> > On Fri, Dec 12, 2008 at 6:06 PM, John Caron <caron@xxxxxxxxxxxxxxxx
> > <mailto:caron@xxxxxxxxxxxxxxxx>> wrote:
> >
> >     Hi Lak:
> >
> >     Im not having any trouble opening from either 4.0 or latest 2.2. Can
> >     you recheck your classpath? Also 4.0 has got less bugs in it at this
> >     point, so you might try it.
> >
> >     Valliappa Lakshmanan wrote:
> >     > John, thanks for looking at this. The file (74MB) is now at:
> >     >
> >     >
http://cimms.ou.edu/~lakshman/data/WRFPRS_GrbF21.grib2<http://cimms.ou.edu/%7Elakshman/data/WRFPRS_GrbF21.grib2>
> >     <http://cimms.ou.edu/%7Elakshman/data/WRFPRS_GrbF21.grib2>
> >     >
> >     > Lak
> >     >
> >     >
> >     > On Fri, Dec 12, 2008 at 1:28 PM, John Caron
> >     <caron@xxxxxxxxxxxxxxxx <mailto:caron@xxxxxxxxxxxxxxxx>
> >     > <mailto:caron@xxxxxxxxxxxxxxxx <mailto:caron@xxxxxxxxxxxxxxxx>>>
> >     wrote:
> >     >
> >     >     Hi Lak:
> >     >
> >     >     NetcdfDataset.open() should have worked.
> >     >
> >     >     Can you send us the file, and we'll check why its not working.
> >     >
> >     >     Valliappa Lakshmanan wrote:
> >     >     > I know there must be a very simple way to do this, but I
> >     can't seem to
> >     >     > find any example or documentation.
> >     >     >
> >     >     > I want to read a Grib2 file using the Java Netcdf API and
> tried:
> >     >     >
> >     >     > File file = new File("/tmp/WRFPRS_GrbF21.grib2");  // a
> >     grib2 file
> >     >     > NetcdfFile ncfile =
> NetcdfDataset.open(file.getAbsolutePath());
> >     >     >
> >     >     > but get an IOException stating: Cant read
> >     >     /tmp/WRFPRS_GrbF21.grib2: not
> >     >     > a valid NetCDF file.
> >     >     >
> >     >     > I tried using ucar.dt.grid.GridDataSet.open() and got the
> >     same result.
> >     >     >
> >     >     > In case it was a classpath/jar problem, I added toolsUI.jar
> from
> >     >     netcdf
> >     >     > 2.2.22 to my classpath (has grib.jar).
> >     >     > Same result.  What am I missing?
> >     >     >
> >     >     > thanks
> >     >     > Lak
> >     >     >
> >     >     >
> >     >     >
> >     >     >
> >     >
> >
> ------------------------------------------------------------------------
> >     >     >
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>
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