Set NetCDF4 filter

This operator sets the NetCDF4 filter specification for selected variables. Filters are mainly used to compress/decompress data. NetCDF4 uses the HDF5 plugins for filter support. To find the HDF5 plugins, the environment variable HDF5_PLUGIN_PATH must point to the directory with the installed plugins. The program may terminate unexpectedly if filters are used whose plugins are not found. A filter specification consists of the filterId and the filter parameters. CDO supports multiple filters connected with '|'. Here is a filter specification for bzip2 (filterId: 307) combined with szip (filterId:4): \"307,9|4,32,32\". Use the CDO option –filter instead of setfilter if all variables require the same filter. More information about NetCDF4 filters can be found in https://docs.unidata.ucar.edu/netcdf-c/current/filters.html.

Usage

cdo_setfilter(ifile, filename = NULL, ofile = NULL)

Arguments

ifile

String with the path to the input file.

filename

STRING - Read filter specification per variable from file [format: varname=\"<filterspec>\"]

ofile

String with the path to the output file.