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Only compression filters that are officially supported by a default installation of the current netCDF4 software distribution should be used in Earth Science data products in netCDF4 or netCDF4-compatible HDF5 formats. |
Recommendation Details: NetCDF4 has enabled access to non-default (i.e., non-DEFLATE) HDF5 compression filters starting from version 4.7.0. However, the filter identification and access are currently obscure (~five digit IDs) and non-portable (no guarantees client software will be able to decompress them). DEFLATE is currently the only compression filter that is guaranteed to work with default (non-customized) netCDF4 installations, and so DEFLATE is the only compression filter that should be used in interoperable Earth Science data products in netCDF4 or netCDF4-compatible HDF5 formats. Use of the shuffle filter is not prohibited since it is not a compression filter and is supported by the netCDF4 default installation. Combining the shuffle and the DEFLATE filters can noticeably improve the data compression ratio.
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