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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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The HDF5 features that netCDF-4 does not support do not occur very often in the wild. The vast majority of existing HDF5 files should be read by netCDF-4 without problems. The main difference is that HDF5 can have circular group structure, and netCDF-4 does not accept that. There is an archaic date format in HDF5 which is not supported by netCDF-4. NetCDF-4 does not permit the writing of szipped files (HDF5 does), but netCDF-4 can read szipped files. I can't remember any other differences. Ward and Dennis, did I miss something? Or has something changed? Ed On Fri, Apr 22, 2016 at 12:33 PM, Pedro Vicente < pedro.vicente@xxxxxxxxxxxxxxxxxx> wrote: > > Hi Russ > > >>>However, there are HDF5 files that netCDF-4 will not open and read, by > design. See the answer to the FAQ How can I convert HDF5 files into > netCDF-4 files?, which lists some HDF5 features netCDF-4 > *>>>>intentionally *does not support > > yes ! > > that was my impression debugging the code some years ago, netCDF was * > intentionally * returning a failure on a pure HDF5 file > glad you pointed that document, I had missed that > > ---------------------- > Pedro Vicente > pedro.vicente@xxxxxxxxxxxxxxxxxx > https://twitter.com/_pedro__vicente > http://www.space-research.org/ > > > > ----- Original Message ----- > *From:* Russ Rew <russrew@xxxxxxxxx> > *To:* Ed Hartnett <edwardjameshartnett@xxxxxxxxx> > *Cc:* John Shalf <jshalf@xxxxxxx> ; cf-metadata@xxxxxxxxxxxx ; Discussion > forum for the NeXus data format <nexus@xxxxxxxxxxxxxxx> ; HDF Users > Discussion List <hdf-forum@xxxxxxxxxxxxxxxxxx> ; Richard.E.Ullman@xxxxxxxx > ; Marinelli, Daniel J. (GSFC-5810) <daniel.j.marinelli@xxxxxxxx> ; > dmh@xxxxxxxx ; netcdfgroup@xxxxxxxxxxxxxxxx ; Miller, Mark C. > <miller86@xxxxxxxx> > *Sent:* Friday, April 22, 2016 11:12 AM > *Subject:* Re: [Nexus] [netcdfgroup] [Hdf-forum] Detecting netCDF versus > HDF5 -- PROPOSED SOLUTIONS --REQUEST FOR COMMENTS > > On Thu, Apr 21, 2016 at 1:56 PM, Ed Hartnett < > edwardjameshartnett@xxxxxxxxx> wrote: > ... > >> The ability of netCDF-4 to open HDF5 files which were written by HDF5 is >> an important feature. It means that users can use tools that were written >> for netCDF on their existing HDF5 files. >> > > However, there are HDF5 files that netCDF-4 will not open and read, by > design. See the answer to the FAQ How can I convert HDF5 files into > netCDF-4 files? > <http://www.unidata.ucar.edu/software/netcdf/docs/faq.html#How-can-I-convert-HDF5-files-into-netCDF-4-files>, > which lists some HDF5 features netCDF-4 *intentionally *does not support, > primarily because these specific features seemed to be of dubious utility > for little benefit. > > NetCDF-4 supports a simpler data model than HDF5, and that was meant to be > a feature, not a bug. > > --Russ > > ------------------------------ > > _______________________________________________ > NeXus mailing list > NeXus@xxxxxxxxxxxxxxx > http://lists.nexusformat.org/mailman/listinfo/nexus > > > _______________________________________________ > netcdfgroup mailing list > netcdfgroup@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ >
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