nc3tonc4 - a program to convert netCDF 3 files to netCDF 4 format files

       This  manual  page  was  written  by  Ross  Gammon <rossgammon@mail.dk> based on the options displayed by
       nc3tonc4 -h.

                                                   22 Mar 2015                                       NC3TONC4(1)

       This manual page documents briefly the nc3tonc4 command.

       nc3tonc4  is a program that converts a netCDF 3 file into netCDF 4 format, optionally unpacking variables
       packed as short integers (with scale_factor and add_offset) to floats, and adding zlib compression  (with
       the  HDF5  shuffle filter and fletcher32 checksum). Data may also be quantized (truncated) to a specified
       precision to improve compression.

       nc3tonc4 - a program to convert netCDF 3 files to netCDF 4 format files

       These programs follow the usual GNU command line syntax, with  long  options  starting  with  two  dashes
       (`-').  A summary of options is included below.

       -h     Shows a summary of the available options.

       -o     Overwrite destination file (default is to raise an error if output file already exists).

       --vars A comma separated list of variable names to copy (default is to copy all variables).

       --classic=(0|1)
              Use NETCDF4_CLASSIC format instead of NETCDF4 (default = 1).

       --zlib=(0|1)
              Activate (or disable) zlib compression (the default is to activate).

       --complevel=(1-9)
              Set the zlib compression level (6 is default).

       --shuffle=(0|1)
              Activate (or disable) the shuffle filter (it is active by default).

       --fletcher32=(0|1)
              Activate (or disable) the fletcher32 checksum (it is not active by default).

       --unpackshort=(0|1)
              Unpack  short  integer  variables  to  float  variables  using  scale_factor and add_offset netCDF
              variable attributes (it is active by default).

       --quantize=(commaseparatedlistofvariablename=integerpairs)
              Truncate the data in the specified variables to a given decimal precision. For example,  'speed=2,
              height=-2,  temp=0'  will  cause  the  variable  'speed'  to  be truncated to a precision of 0.01,
              'height' to a precision of 100 and 'temp' to 1. This can significantly  improve  compression.  The
              default is not to quantize any of the variables.

       --quiet=(0|1)
              If set to 1, don't print any diagnostic information.

       --chunk=(integer)
              The number of records along unlimited dimension to write at once. The default is 10. It is ignored
              if there is no unlimited dimension. If chunk=0, it means write all the data at once.

       --istart=(integer)
              The  number  of the record to start at along unlimited dimension. The default is 0. This option is
              ignored if there is no unlimited dimension.

       --istop=(integer)
              The number of the record to stop at along unlimited dimension. The default is 1.  This  option  is
              ignored if there is no unlimited dimension.

ncinfo(1), nc4tonc3(1).

nc3tonc4   [-h]   [-o]   [--vars=var1,var2,..]    [--zlib=(0|1)]   [--complevel=(1-9)]  [--shuffle=(0|1)]
       [--fletcher32=(0|1)]     [--unpackshort=(0|1)]      [--quantize=var1=n1,var2=n2,..]       netcdf3filenamenetcdf4filename