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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
netCDF Operators NCO version 5.1.0 are brachiating toward you http://nco.sf.net (Homepage, Mailing lists, Help) http://github.com/nco (Source Code, Issues, Releases, Developers) What's new? Version 5.1.0 supports the new netCDF 4.9.0 features for filters and quantization. This is a significant new feature that justifies the version bump from 5.0.7 to 5.1.0. There is also an ncremap fix for sub-sub-gridscale regridding, e.g., landunit-specific regridding. Users of sub-SGS regridding, and anyone interested is using modern compression or quantization algorithms such as Bzip2, Zstandard, Granular BitGroom, and BitRound. Work on NCO 5.1.1 has commenced and will polish support for quantization/compression algorithms and add support for NCZarr I/O. Enjoy, Charlie NEW FEATURES (full details always in ChangeLog): A. All numeric NCO operators support new compression features when linked to a default installation of the latest netCDF, 4.9.0. These features and how to access and tune them are extensively documented in the manual. Suffice it to say that all NCO users now have transparent access to modern lossless (Bzip2, Zstandard) and lossy (BitRound, Granular BitRound) compression algorithms. Codecs from the netCDF C-library, the Community Codec Repository (CCR), and from user-installed HDF5 filters may all be used. The commands will look something like this: ncks --cmp='granularbr,3|shuffle|zstandard,3' ... # Long-names ncks --cmp='gbr,3|shf|zst,3' ... # Abbreviations and levels ncks --cmp='gbr|shf|zst' ... # Default levels ncks --cmp='f32|gbr|shf|bz2|dfl|zst' ... # Multiple codecs ncwa --cmp='gbr|shf|zst' ... # Other operators... ncbo --cmp='gbr|shf|zst' ... # All numeric operators, in fact ncclimo --cmp='btr\|shf\|zstd' ... # Climo generator ncremap --cmp='btr\|shf\|zstd' ... # Regridder Full documentation (including figures) is at http://nco.sf.net/nco.html#compression Thanks to Ed Hartnett (NOAA) and Dennis Heimbigner (Unidata) for guiding the addition of these features into the CCR and netCDF. BUG FIXES: A. NCO 5.0.7 contained a bug in its new feature that allows missing values in fields with valid SGS area. ncremap < 5.0.7 assumed fields to be valid wherever sgs_frc > 0.0. This assumption is valid for ~95% of ELM/CLM fields. However, it low-biased landunit-specific fields (like TSOI, H2OSOI) in transition areas (e.g., ablation zone) with valid SGS, and invalid landunit. NCO 5.0.7 mostly fixed that, though it had a corner-case bug triggered mostly in multi-level fields (like TLAKE, TSOI). The normalization for multi-level fields is now correct, thus allowing sub-sub-gridscale regridding to work in all known cases. ncremap -P elm --map=map.nc in.nc out.nc http://nco.sf.net/nco.html#sgs Full release statement at http://nco.sf.net/ANNOUNCE -- Charlie Zender, Earth System Sci. & Computer Sci. University of California, Irvine 949-891-2429 )'(
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