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 before
> installing). I will uninstall this and manually install the binaries to test
> 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
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>> > > For list information or to unsubscribe, visit:
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>> > /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.
>> >
>> > _______________________________________________
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>> > ailing_lists/
>
>
>
>
> --
> Taylor Binnington
> e. tbinnington@xxxxxxxxx
> c. 647 926 4144
>
>
> _______________________________________________
> netcdfgroup mailing list
> netcdfgroup@xxxxxxxxxxxxxxxx
> For list information or to unsubscribe, visit:
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--
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
