Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
"Pascoe, Stephen (STFC,RAL,SSTD)" <stephen.pascoe@xxxxxxxxxx> writes: > I'd like to clarify how using HDF5 with SZIP support affects the files > created by the NetCDF4 library. >  > According to the NetCDF4 INSTALL file you can optionally use HDF5+SZIP > when building NetCDF4. This implies that either SZIP-compressed NetCDF4 > is byte-compatible with ZIP-compressed NetCDF4 or that there are 2 > incompatible compressed NetCDF4 formats (ZIP and SZIP). Can you confirm > it is the former? It's simple. NetCDF-4 cannot create SZIP compressed HDF5 files. But it is possible to read some HDF5 files with netCDF-4, even though they were not created with netCDF-4. (This capability will expand with the 4.1 release, which will read any HDF5 file that does not use references, circular group structures, or a few other HDF5 features that are not supported in netCDF). So the point of building HDF5 with SZIP is to allow these szip compressed files to be read by netCDF-4. This is a read-only capability. > Assuming it is the former, what is the advantage of using SZIP? Is SZIP > automatically used if the HDF5 library has it? >  > Thanks, > Stephen. >  Fans of szip say it gives better compression. Thanks, Ed -- Ed Hartnett -- ed@xxxxxxxxxxxxxxxx
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