Taylor,
The netCDF-Java library can read HDF-EOS data, so if the data is
available from a server that uses netCDF-Java, such as TDS, then your
C++ program can access the HDF-EOS data using the OPeNDAP client
that's available with a recent netCDF-C based library built with DAP
protocol support enabled (the default if libcurl is available at build
time).
As Dan Packman pointed out, you could instead download and make use of
one of the HDF-EOS tools available from
http://hdfeos.org/software/tool.php
which also includes
HDF-EOS5 to netCDF-4 Converter -- converts HDF-EOS5 to netCDF-4
Description: HDF-EOS5 to netCDF-4 Converter converts an HDF-EOS5 file
to a netCDF-4 file that the netCDF-4 library can read. Unlike the
HDF-EOS5 Augmentation Tool, this tool creates a new file that the
HDF-EOS5 library cannot read.
--Russ
> Hi Taylor,
>
> it's been a few years since I analyzed HDF-EOS data, but in case it's
> useful, I'll offer that at that time HDF-EOS was a specialized kind of
> *HDF* file, not a specialized kind of netcdf file. You need a separate
> HDF-EOS library to access those files, not the netcdf4 library.
>
> Maybe things have changed, but you might be better off first looking
> for HDF-EOS specific libraries.
>
> Regards,
>
> --Dave
>
>
> On Mon, Dec 17, 2012 at 9:35 AM, Taylor Binnington
> <tbinnington@xxxxxxxxx> wrote:
> > Thank you for the replies.
> >
> > I see. I'm still learning the differences between these file formats. It
> > appears that MERRA climate data is stored in HDF-EOS format, which is a
> > specialized kind of NetCDF-4... what are the chances that I will ever be
> > able to read this, even with newest versions of NetCDF with some HDF5 and
> > HDF4 support?
> >
> > I am running netcdf-4.0.1-19.1, since that is what was available in the
> > openSUSE geo repository as an rpm (therefore no, I did not make check befor
> e
> > installing). I will uninstall this and manually install the binaries to tes
> t
> > the most current version (with fingers crossed that HDF-EOS is supported).
> >
> >
> > On Mon, Dec 17, 2012 at 11:56 AM, Russ Rew <russ@xxxxxxxxxxxxxxxx> wrote:
> >>
> >> Taylor,
> >>
> >> More recent versions of netCDF-4 can access HDF5 data (and even HDF4
> >> data) that was not written by netCDF-4, but not arbitrary HDF5 files.
> >> Interoperability with HDF5 is documented here:
> >>
> >> http://www.unidata.ucar.edu/netcdf/docs/interoperability_with_hdf5.html
> >>
> >> and in these FAQs:
> >>
> >> http://www.unidata.ucar.edu/netcdf/docs/faq.html#fv20
> >> http://www.unidata.ucar.edu/netcdf/docs/faq.html#fv15
> >>
> >> If netCDF-4 gets a segfault opening an HDF5 file, that's either a bug in
> >> the legacy C++ library you're using or a bug in the accessing program.
> >>
> >> I just tried this example C++ program with the C++ library in netCDF
> >> version 4.1.3:
> >>
> >> http://www.unidata.ucar.edu/netcdf/examples/programs/simple_xy_rd.cpp
> >>
> >> changing the test file to a file that doesn't exist, and
> >> it seemed to behave correctly:
> >>
> >> $ ./simple_xy_rd
> >> Couldn't open file!
> >>
> >> What version of the netCDF C++ library are you using? Did you run "make
> >> check" before installing it?
> >>
> >> --Russ
> >>
> >> > Hi Taylor:
> >> >
> >> > The netcdf library can not open arbitrary HDF files, only ones built
> >> > with the
> >> > netcdf4 library. If this file was not built with the netcdf4 library,
> >> > then
> >> > yes you will get an error.
> >> >
> >> > HTH,
> >> >
> >> > -Roy M.
> >> > On Dec 17, 2012, at 8:14 AM, Taylor Binnington <tbinnington@xxxxxxxxx>
> >> > wrote:
> >> >
> >> > > Hi all,
> >> > >
> >> > > This is my first time using the NetCDF C++ libraries, and I can't seem
> >> > > to g
> >> > et started. I would like to open an HDF file from a program using
> >> > NcFile, usi
> >> > ng the following:
> >> > >
> >> > > NcFile dataFile("MERRA300.prod.assim.inst3_3d_asm_Cp.20120101.hdf",
> >> > > NcFile:
> >> > :ReadOnly);
> >> > >
> >> > > However, gdb reveals a segfault at this line (yes, the file is stored
> >> > > in th
> >> > e same directory as the test script). Interestingly, I also receive the
> >> > same
> >> > error when I intentionally attempt to open a file that does not exist,
> >> > which
> >> > I find strange (I would have expected a 'file not found' type of error),
> >> > and
> >> > it makes me think that I simply can not open an HDF file with these
> >> > libraries
> >> > . Is this true? How would I proceed? Thank you in advance,
> >> > >
> >> > > Taylor Binnington
> >> > >
> >> > > --
> >> > > Taylor Binnington
> >> > > e. tbinnington@xxxxxxxxx
> >> > > c. 647 926 4144
> >> > >
> >> > > _______________________________________________
> >> > > netcdfgroup mailing list
> >> > > netcdfgroup@xxxxxxxxxxxxxxxx
> >> > > For list information or to unsubscribe, visit:
> >> > > http://www.unidata.ucar.edu
> >> > /mailing_lists/
> >> >
> >> > **********************
> >> > "The contents of this message do not reflect any position of the U.S.
> >> > Governm
> >> > ent or NOAA."
> >> > **********************
> >> > Roy Mendelssohn
> >> > Supervisory Operations Research Analyst
> >> > NOAA/NMFS
> >> > Environmental Research Division
> >> > Southwest Fisheries Science Center
> >> > 1352 Lighthouse Avenue
> >> > Pacific Grove, CA 93950-2097
> >> >
> >> > e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
> >> > voice: (831)-648-9029
> >> > fax: (831)-648-8440
> >> > www: http://www.pfeg.noaa.gov/
> >> >
> >> > "Old age and treachery will overcome youth and skill."
> >> > "From those who have been given much, much will be expected"
> >> > "the arc of the moral universe is long, but it bends toward justice"
> >> > -MLK Jr.
> >> >
> >> > _______________________________________________
> >> > netcdfgroup mailing list
> >> > netcdfgroup@xxxxxxxxxxxxxxxx
> >> > For list information or to unsubscribe, visit:
> >> > http://www.unidata.ucar.edu/m
> >> > ailing_lists/
> >
> >
> >
> >
> > --
> > Taylor Binnington
> > e. tbinnington@xxxxxxxxx
> > c. 647 926 4144
> >
> >
> > _______________________________________________
> > netcdfgroup mailing list
> > netcdfgroup@xxxxxxxxxxxxxxxx
> > For list information or to unsubscribe, visit:
> > http://www.unidata.ucar.edu/mailing_lists/
>
>
>
> --
> David W. Pierce
> Division of Climate, Atmospheric Science, and Physical Oceanography
> Scripps Institution of Oceanography, La Jolla, California, USA
> (858) 534-8276 (voice) / (858) 534-8561 (fax) dpierce@xxxxxxxx
