The netCDF Operators, NCO, are a suite of command line programs known as operators. The operators facilitate manipulation and analysis of self-describing data stored in the freely available netCDF and HDF formats (http://www.unidata.ucar.edu/packages/netcdf and http://hdf.ncsa.uiuc.edu, respectively). Each NCO operator (e.g., ncks) takes netCDF or HDF input file(s), performs an operation (e.g., averaging, hyperslabbing, or renaming), and outputs a processed netCDF file. Although most users of netCDF and HDF data are involved in scientific research, these data formats, and thus NCO, are generic and are equally useful in fields from agriculture to zoology. The NCO User's Guide illustrates NCO use with examples from the field of climate modeling and analysis. The NCO homepage is http://nco.sourceforge.net/.
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