Re: NetCDF java libraries: versions 1 and 2

i have it on my "answer this email" list.
currently im sick and just doing triage. also, i will be gone next week 
so i may not get to it until after Tday.

but heres a short answer:

i assume matlab has acceess to all public classes and methods?

then you may want to open as ucar.nc2.dataset.NetcdfDataset to get 
access to coordinate systems, or better, with 
ucar.nc2.dataset.grid.GridDataset (if its a grid)

Rich Signell wrote:

> John,
>
> uh oh - now I know you're there!
>
> If you got my recent e-mail inquiry about netcdf-java & OpenDAP, could 
> you drop me a quick message to say whether you are:
> 1) pondering a reply and will answer eventually when time permits
> 2) using the "he'll-ask-again-if-it's-really-important" filter
> 3) ignoring it since it should have been asked to a news group
>
> Thanks!
> -Rich
>
>
> John Caron wrote:
>
> > Scott Neu wrote:
> >
> > > Hello,
> > >
> > > I know I'm somewhat behind the times, but a while ago I downloaded the
> > > NetCDF java library version 1 and integrated that into my code. 
> > > Everything has been great up until last July, when I started to receive
> > > reports that my code was no longer able to parse certain NetCDF files.
> > >
> > > The obvious solution is to upgrade to version 2, but the class library
> > > has changed too much for me to do this quickly (and I just don't have
> > > the time right now).
> > >
> > > My question is:  is there a quick patch I can write to parse these 
> > > newer
> > > NetCDF files using the version 1 library? 
> >
> >
> >
> > no, im afraid version 1 is no longer maintained.
> >
> > Did a substantial change
> >
> > > occur in the definition of NetCDF files?
> >
> >
> >
> > one  possibility is that you are seeing truncated files. double check 
> > with the C library ncdump program, and dump the values of the last 
> > variable in the file. if that fails, you have a truncated file.
> >
> > otherwise, maybe you are seeing the "truncated netcdf problem" where 
> > the writer doesnt write all the bytes to the file. this has always 
> > been there and i guess you are just seeing these now (??).
> >
> > there has been a change to allow files > 2 GB, but those files are 
> > not in wide circulation. dump out the first 4 bytes of your file, old 
> > version has CDF1 and new has CDF2 (where the 4th byte is numeric, not 
> > character)
> >
> > > I get end-of-file errors as the offsets to the variable data are larger
> > > than the file lengths themselves.
> > >
> > > thanks for any helpful advice,
> > > Scott
> > >
> > > java.io.EOFException
> > >         at
> > > javax.imageio.stream.ImageInputStreamImpl.readInt(ImageInputStreamImpl.java:235) 
> > >
> > >         at
> > > ucar.netcdf.NetcdfStream$V1IntegerIo.readArray(NetcdfStream.java:1090)
> > >         at ucar.netcdf.NetcdfStream$V1Io.toArray(NetcdfStream.java:757)
> > >         at ucar.netcdf.NetcdfStream$V1Io.toArray(NetcdfStream.java:721)
> > >         at ucar.netcdf.Variable.toArray(Variable.java:296)
> > >         at ucar.nc2.Variable.read(Variable.java:229)
> > >         at ucar.nc2.NetcdfStream.cacheData(NetcdfStream.java:102)