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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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.
The netCDF Operators NCO version 4.7.6 have hatched. http://nco.sf.net (Homepage, Mailing lists, Help) http://github.com/nco (Source Code, Issues, Releases, Developers) What's new? Version 4.7.6 is primarily a feature release for ncremap. There are two new processing modes, one for regridding regional data, and one for generating all mapfile permutations with all interpolation algorithms. There is also improved support for auxiliary coordinates that lack coordinates/standard_name conventions, improved ncap2 command-line script handling in Windows, and less intrusive HPSS file system support. Work on NCO 5.0.0 has commenced "under the hood". The key leap in that release will be support for netCDF4 user-defined types. Printing of netCDF4 user-defined types ENUM and VLEN is ready now (though unsupported) with the --udt flag. 5.0.0 will contain the finished version of that, and progress on weight generation by ncremap. Enjoy, Charlie NEW FEATURES (full details always in ChangeLog): A. NCO versions 4.6.6+ (April, 2017) has looked for files on an HPSS filesystem when it could not find them elsewhere. This produces messages considered intrusive by many users, who do not have HPSS. Now users must opt-in to HPSS searches by adding the --hpss flag: ncks -l . --hpss /home/zender/nco/in.nc http://nco.sf.net#hpss B. ncremap now regrids regional output produced by CESM CAM-SE and E3SM EAM models. Models output these RRG (for "regional regridding" format) files if requested by the finclNlonlat namelist parameter. RRG files from FV-dycore simulations were already regriddable, and now SE-dycore RRG files are too:ncremap --dat_glb=dat_glb.nc --grd_glb=grd_glb.nc -g grd_rgn.nc dat_rgn.nc dat_rgr.nc
Documentation is currently available to E3SM users at https://acme-climate.atlassian.net/wiki/spaces/SIM/pages/754286611/Regridding+E3SM+Data+with+ncremap and to others via email request (it will be in Users Guide soon). C. ncremap includes an MWF-mode (for "Make All Weight Files") that generates and names, with one command and in a self-consistent manner, all combinations of E3SM global atmosphere<->ocean maps with both ERWG and Tempest. MWF-mode automates the laborious and error-prone process of generating numerous map-files with various switches. Its chief use occurs when developing and testing new global grid-pairs for the E3SM atmosphere and ocean components:ncremap -P mwf -s grd_ocn -g grd_atm --nm_src=ocn_nm --nm_dst=atm_nm --dt_sng=date
Documentation is currently available to E3SM users at https://acme-climate.atlassian.net/wiki/spaces/SIM/pages/754286611/Regridding+E3SM+Data+with+ncremap and to others via email request (it will be in Users Guide soon). D. ncap2 string-handling is now more compatible between Windows and better OSs. Previously, some ncap2 scripts could behave differently due to the Windows definition of the C++ c_str() function. BUG FIXES: A. NCO completes when chunking into non-netCDF4 files (of course it ignores the chunking request). Previous NCO tried to complete but dumped-core. B. NCO now only prints one WARNING about user-specified chunk size for record dimension being too big. C. Repeated notice: netCDF 4.6.1 fixes the CDF5 bug described here http://nco.sf.net#bug_cdf5 We STRONGLY recommend that CDF5 users upgrade to netCDF 4.6.1. NCO error messages and HINTs have been updated to better describe the best practices to identify and avoid this nasty bug. 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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