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.
netCDF Operators NCO version 5.1.5 ascend the Silicon Throne http://nco.sf.net (Homepage, Mailing lists, Help) http://github.com/nc/ncoo (Source Code, Issues, Releases) What's new? Version 5.1.5 polishes the new vertical interpolation capabilities introduced in 5.1.3 and 5.1.4, improves the safety NCZarr operations, and fixes minor ncremap bugs. This release can be skipped if these regridding and NCZarr features are not useful to you. Work on NCO 5.1.6 has commenced and aims to add support for Zarr S3 stores and to polish support for new codecs. Enjoy, Charlie NEW FEATURES (full details always in ChangeLog): A. ncremap now behaves more sensibly when vertically interpolating MPAS-Ocean files/fields. Previously, users had to explicitly add the multidimensional auxiliary depth coordinate (often timeMonthly_avg_zMid) to the subsetted list of variables whenever the subset list option (-v var1,var2...) was used. This is because most MPAS datasets do not adhere to the CF "coordinates" convention, and NCO has no way of knowing which auxiliary coordinates contain the depth field. Now ncremap uses the -P mpasocean option to trigger a search for the zMid coordinate in the input file. If found, ncremap automatically adds it to the subset as appropriate. ncremap -P mpas --vrt_out=vrt.nc --map=map.nc in.nc out.nc http://nco.sf.net/nco.html#ncremap http://nco.sf.net/nco.html#vrt_out B. ncremap has a --ps_rtn (--retain_surface_pressure) switch to facilitate "round-trip" vertical interpolation such as hybrid->pressure->hybrid. By default ncremap excludes the surface pressure field from the output after hybrid->pressure interpolation. The --ps_rtn switch (which takes no argument) instructs the regridder to retain the surface pressure field after hybrid->pressure interpolation. This field is then available for subsequent interpolation back to a hybrid vertical coordinate. ncremap --ps_rtn --ps_nm=ps --vrt_out=ncep.nc in.nc out_ncep.nc ncremap --ps_rtn -v T,Q,U,PS --vrt_out=ncep.nc in.nc out_ncep.nc ncremap --vrt_out=hybrid.nc out_ncep.nc out_hybrid.nc http://nco.sf.net/nco.html#ps_rtn C. NCO is now more careful about overwriting existing directories and files with NCZarr stores. Previously NCO would overwrite any directory or file that the netCDF library could successfully open. However, netCDF library versions 4.8.0->4.9.1 "succeed" in opening non-NCZarr stores. Hence additional precautions are necessary to avoid unintentionally overwriting non-NCZarr paths with NCZarr stores. For example, ncks in_zarr4.nc file://${HOME}/ncz_dnd/foo#mode=nczarr,file now overwrites "foo" only if it is already an NCZarr store. Previously foo would be overwritten if it already existed yet was not a valid NCZarr store. Thanks to Dennis Heimbigner of Unidata for discussing this behavior. D. NCO improves handling of output from the DOE EAMxx model in two ways. First, NCO now treats this model output as CF-compliant. This causes NCO to implement special conventions such as carrying multi-dimensional auxiliary coordinate variables when subsetting. Second, ncremap automatically permutes EAMxx datasets that have been interpolated to pressure levels to have the correct dimension ordering (horizontal dimension as most-rapidly-varying) prior to horizontal regridding. Thanks to Chris Golaz (LLNL) prompting these features. BUG FIXES: A. ncrcat versions 4.8.0--5.1.4 could erroneously add a cell_methods attribute to variables it processed. This behavior has been eliminated. ncra still adds the attribute by default. The workaround is to invoke ncrcat with the --no_cll_mth flag. The solution is to upgrade. Thanks to Brian Vanderwende (NCAR) for reporting this. B. Recent versions of ncremap incorrectly parsed the --preserve_statistic (--prs_stt) option. The option was effectively ignored. This has been fixed. The workaround is to explicitly invoke the --rnr_thr=0.0 option. The solution is to upgrade. These two commands now produce the same result, use whichever you prefer: ncremap --rnr_thr=0.0 --map=map.nc in.nc out.nc ncremap --prs_stt=local_mean --map=map.nc in.nc out.nc C. ncremap version 5.1.4 incorrectly handles the name of the output coordinate for vertical interpolation to pure-pressure surfaces. Instead of naming the coordinate 'plev', or whatever is in the vrt_out file, or what was specfified by the --plev_nm_out option, it just named the coordinate (variable+dimension) 'lev'. These have all been fixed. There is no workaround, and the solution is to upgrade. Thanks to Jill Zhang (LLNL) and Ben Hillman (SNL) for reporting this issue. D. Vertical interpolation with ncremap now successfully handles missing values interior to the vertical domain. This is useful to interpolate from pure pressure and depth coordinates where bathymetry and orography are masked, to terrain following sigma coordinates where bathymetry and orography are outside the domain. Previously ncremap would allow missing values inside the vertical domain to contaminate the interpolated values. There is no workaround. The solution is to upgrade. Thanks to Peter Caldwell (LLNL) for reporting this issue and beta-testing the fix. 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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