nc3tonc4 - Online in the Cloud

PROGRAM:

NAME

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

SYNOPSIS

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,..] netcdf3filename netcdf4filename

DESCRIPTION

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.

OPTIONS

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 Overwite 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=(comma separated list of variable name=integer pairs)
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.

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