NetCDF operators (NCO) version 4.7.8

Version 4.7.8 of the netCDF Operators (NCO) has been released. NCO is an Open Source package that consists of a dozen standalone, command-line programs that take netCDF files as input, then operate (e.g., derive new data, average, print, hyperslab, manipulate metadata) and output the results to screen or files in text, binary, or netCDF formats.

The NCO project is coordinated by Professor Charlie Zender of the Department of Earth System Science, University of California, Irvine. More information about the project, along with binary and source downloads, are available on the SourceForge project page .

From the release message:

Version 4.7.8 contains many improvements to help convert ESM output into CMIP6 timeseries format. In particular, ncclimo coordinates better with ncremap when processing MPAS data and regridding. They can use ncpdq's new feature to convert doubles to floats, and raw binary output can now be byte-swapped to ease creation of offline datasets for some models like WRF and CICE.

New Features
  1. ncclimo and ncremap accept the --d2f flag to turn-on the dbl_flt packing map that converts double-precision to single-precision.
    ncclimo --d2f ...
    ncremap --d2f ...
    http://nco.sf.net/nco.html#dbl_flt
    http://nco.sf.net/nco.html#ncpdq
  2. ncremap adds missing values to single-precision MPAS variables as well as double. Previously it only added _FillValue to doubles.
    http://nco.sf.net/nco.html#ncremap
  3. NCO takes advantage of faster stride access in netCDF 4.6.2. Previously NCO used its own workaround to accelerate strides. It will continue to do so with older version of netCDF.
  4. ncremap improves metadata annotation for Tempest monotr maps.
  5. ncks provides the --bsa flag to invoke a byte-swap algorithm. Setting this option causes unformatted binary output (with --bnr) to be output in byte-swapped order relative to the host machine:
    ncks -O -v uint32_var.? --bsa=1 -b foo.bnr in_grp.nc foo.nc
    http://nco.sf.net/nco.html#bnr

Additional details are available in the ChangeLog.

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