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[netCDF #XKH-644219]: Problem reading an HDF file with netcdf4.

Hi Benno,

Sorry to have taken so long to respond to your question about netCDF-4
reading HDF4 MODIS files.  (I assume they're HDF-EOS?)
The developer who added the HDF4 support to the netCDF C library, got
lured away to another position, and took all our HDF4 expertise with him.

I tried to build the latest netCDF-4 snapshot release with HDF4 support,
and hit an obstacle that I didn't immediately know how to get over, so
I've been unable to reproduce the problem you reported.

But it sounds like a problem with the original data rather than netCDF-4.

One other thing you could try is the netCDF-Java library.  It has an
independent implementation of access to HDF-EOS data.  If you can find
access to the data through a TDS (THREDDS) server, it will be using the 
netCDF-Java implementation.

--Russ

> I find that I also get errors with the following files using an old copy of
> hdp, an HDF utility.
> 
> ftp://e4ftl01.cr.usgs.gov/MOLT/MOD13Q1.005/2003.06.26/
> 
> MOD13Q1.A2003177.h03v07.005.2007337230353.hdf
> MOD13Q1.A2003177.h12v08.005.2007339004035.hdf
> MOD13Q1.A2003177.h16v09.005.2007338155926.hdf
> MOD13Q1.A2003177.h23v01.005.2007339013733.hdf
> MOD13Q1.A2003177.h25v04.005.2007338010642.hdf
> 
> 
> hdp list displays a bunch of zeros before its usual Linked Blocks Indicator
> for most of this files
> netcdf4 cannot read at least one of the channels in such a file
> 
> except h23v01 cannot be read at all by hdp, gives an
> 
> HDF error: (59) <HDF Internal error>
> Detected in HMCPendaccess() [hchunks.c line 3633]
> HDF error: (58) <Invalid arguments to routine>
> Detected in HMCPcloseAID() [hchunks.c line 3516]
> 
> 
> Since even a pure HDF program gives errors, perhaps there is something that
> USGS can do to repair/replace the files?  Or is there a problem with older
> versions of the HDF library?
> 
> Benno
> 
> 
> address@hidden> wrote:
> 
> >
> > Benno Blumenthal,
> >
> > Your Ticket has been received, and a Unidata staff member will review it
> > and reply accordingly. Listed below are details of this new Ticket. Please
> > make sure the Ticket ID remains in the Subject: line on all correspondence
> > related to this Ticket.
> >
> >    Ticket ID: XKH-644219
> >    Subject: Problem reading an HDF file with netcdf4.
> >    Department: Support netCDF
> >    Priority: Normal
> >    Status: Open
> >
> >
> >
> > The NetCDF libraries are developed at the Unidata Program Center/UCAR,
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> 
> 
> --
> Dr. M. Benno Blumenthal          address@hidden
> International Research Institute for climate and society
> The Earth Institute at Columbia University
> Lamont Campus, Palisades NY 10964-8000   (845) 680-4450
> 
> 
Russ Rew                                         UCAR Unidata Program
address@hidden                      http://www.unidata.ucar.edu



Ticket Details
===================
Ticket ID: XKH-644219
Department: Support netCDF
Priority: High
Status: Closed