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[netCDFJava #IHC-743264]: Problems reading GRIB2 files

Greetings Jeff,

> Since there are no Java docs on ucar.grib.grib2

I do apologize for the lack of current javadocs...I am not sure what happened 
there.  The
best I can do today is point you to the source code (lame, I know):

https://github.com/Unidata/thredds/tree/v4.3.14

The GRIB stuff is located in the grib module, although you will likely be 
interested in
this particular part:

https://github.com/Unidata/thredds/tree/v4.3.14/grib/src/main/java/ucar/grib

> and the software doesn't seem to work on GRIB files at all,

Can you explain a bit more about how it's not working? I've uploaded a copy of a
working toolsUI jar file (the one on our site is having jar signing issues):

https://www.unidata.ucar.edu/staff/sarms/toolsUI-4.3.14_snapshot.jar

Would you mind trying to open your GRIB2 file using it?  Click the tab "Isop" 
-> "GRIB2" 
-> "GRIB2collection" and use the folder icon to load in your file. If it works, 
then 
netCDF-Java will work for your GRIB file.

> I'm going to assume that in fact the portion of the software for reading GRIB 
> files 
> either isn't finished or that plans for the software to work with GRIB have 
> been dropped.

Plans for GRIB have certainly not been dropped. A considerable amount of work 
has been 
put into getting grib right, which is perhaps the most major change from 4.2 to 
4.3.  For
example, see these series of blogs by John Caron, the lead netCDF-Java 
developer:

http://www.unidata.ucar.edu/blogs/developer/en/tags/grib

Cheers,

Sean

> Thank you for your help.
> 
> Jeff
> 
> 
> "It is perhaps easier, and certainly safer,
> to follow a beaten path, but it is also
> dull, uninteresting, and futile."
> - Dmitri Shostakovich
> 
> 
> ________________________________
> From: Unidata netCDF Java Support <address@hidden>
> To: address@hidden
> Cc: address@hidden
> Sent: Wednesday, November 21, 2012 9:59 AM
> Subject: [netCDFJava #IHC-743264]: Problems reading GRIB2 files
> 
> Greetings Jeff,
> 
> You can find the tutorial here:
> 
> http://www.unidata.ucar.edu/software/netcdf-java/tutorial/index.html
> 
> The reference docs to into a bit more detail:
> 
> http://www.unidata.ucar.edu/software/netcdf-java/reference/index.html
> 
> There is a little snippet dealing specifically with GRIB files:
> 
> http://www.unidata.ucar.edu/software/netcdf-java/formats/GribFiles.html
> 
> and the JavaDocs are here:
> 
> http://www.unidata.ucar.edu/software/netcdf-java/v4.3/javadoc/index.html
> 
> Note that the javadocs haven't updated since we did the stable 4.3 release
> yesterday, so I will try to get that updated.
> 
> We try to keep our documentation up-to-date and write as we develop; is
> there something in particular you are looking for?
> 
> Cheers!
> 
> Sean
> 
> > Sorry, I'm not finding any documentation. Just an overview.
> >
> >
> > Jeff
> >
> >  
> > "It is perhaps easier, and certainly safer,
> > to follow a beaten path, but it is also
> > dull, uninteresting, and futile."
> > - Dmitri Shostakovich
> >
> >
> > ________________________________
> > From: Unidata netCDF Java Support <address@hidden>
> > To: address@hidden
> > Cc: address@hidden
> > Sent: Tuesday, November 20, 2012 4:42 PM
> > Subject: [netCDFJava #IHC-743264]: Problems reading GRIB2 files
> >
> > The documentation is available here:
> >
> > http://www.unidata.ucar.edu/software/netcdf-java/documentation.htm#current
> >
> > Cheers,
> >
> > Sean
> >
> > > Is there any documentation available for 4.3?
> > >
> > > Jeff
> > >
> > >  
> > > "It is perhaps easier, and certainly safer,
> > > to follow a beaten path, but it is also
> > > dull, uninteresting, and futile."
> > > - Dmitri Shostakovich
> > >
> > >
> > > ________________________________
> > > From: Unidata netCDF Java Support <address@hidden>
> > > To: address@hidden
> > > Cc: address@hidden
> > > Sent: Tuesday, November 20, 2012 3:32 PM
> > > Subject: [netCDFJava #IHC-743264]: Problems reading GRIB2 files
> > >
> > > Hi Jeff,
> > >
> > > It's linked off of the page I sent, but you can download it directly here:
> > >
> > > ftp://ftp.unidata.ucar.edu/pub/netcdf-java/v4.3/netcdfAll-4.3.jar
> > >
> > > Note that 4.3 is considered beta, but you for sure want to be using it if
> > > you are working with GRIB.
> > >
> > > Cheers,
> > >
> > > Sean
> > >
> > > > Where do I get version 4.3 from? I only see version 4.2 on 
> > > > www.unidata.ucar.edu/downloads/netcdf
> > > >
> > > > Jeff
> > > >  
> > > >
> > > > "It is perhaps easier, and certainly safer,
> > > > to follow a beaten path, but it is also
> > > > dull, uninteresting, and futile."
> > > > - Dmitri Shostakovich
> > > >
> > > >
> > > > ________________________________
> > > > From: Unidata netCDF Java Support <address@hidden>
> > > > To: address@hidden
> > > > Cc: address@hidden
> > > > Sent: Tuesday, November 20, 2012 2:32 PM
> > > > Subject: [netCDFJava #IHC-743264]: Problems reading GRIB2 files
> > > >
> > > > Greetings Jeff,
> > > >
> > > > If you are dealing with GRIB files, you should use netCDF-Java 4.3. The
> > > > GRIB handling in 4.2 is broken. See the note for GRIB users here and try
> > > > the 4.3 jar:
> > > >
> > > > https://www.unidata.ucar.edu/software/netcdf-java/documentation.htm#v43
> > > >
> > > > Cheers!
> > > >
> > > > Sean
> > > >
> > > > > Full Name: Jeff Smith
> > > > > Email Address: address@hidden
> > > > > Organization: Front Range Community College
> > > > > Package Version: 4.2
> > > > > Operating System: Windows 7
> > > > > Hardware:
> > > > > Description of problem:
> > > > >
> > > > > I downloaded and installed netcdf-4.2.jar on my Windows laptop. My 
> > > > > need is
> > > > > to read GRIB2 files from NCEP. I have encountered several problems. 
> > > > > The
> > > > > most serious is that, according to the documnentation, objects from
> > > > > the class Grib2ProductDefintionSection have a method that returns an
> > > > > object of the class Grib2PDSVariables, but there is no such class as
> > > > > Grib2PDSVariables in the package.
> > > > >
> > > > > Another serious problem is that the class Grib2GridDefinitionSection
> > > > > does not appear to read in the correct number of bytes. This results 
> > > > > in
> > > > > an array out of bounds exception being raised in line 1741 of method
> > > > > getInt in Grib2GDSVariables.java (which is called from line 82 of
> > > > > GribGDSVariables.java, which in turn is in a method called from line
> > > > > 418 of Grib2GridDefinitionSection.java). I have verified that all the
> > > > > GRIB2 files that I have tested with are properly constructed GRIB2 
> > > > > files.
> > > > >
> > > > >
> > > >
> > > > Ticket Details
> > > > ===================
> > > > Ticket ID: IHC-743264
> > > > Department: Support netCDF Java
> > > > Priority: Normal
> > > > Status: Open
> > > >
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: IHC-743264
> > > Department: Support netCDF Java
> > > Priority: Normal
> > > Status: Open
> > >
> >
> > Ticket Details
> > ===================
> > Ticket ID: IHC-743264
> > Department: Support netCDF Java
> > Priority: Normal
> > Status: Open
> >
> 
> Ticket Details
> ===================
> Ticket ID: IHC-743264
> Department: Support netCDF Java
> Priority: Normal
> Status: Open
> 

Ticket Details
===================
Ticket ID: IHC-743264
Department: Support netCDF Java
Priority: Normal
Status: Open