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SYNOPSIS
grads2nc infile.ctl outfile.nc [ -n ] [ -r ] [ -v | -q ]
DESCRIPTION
grads2nc converts a data file in GrADS format to the more portable netCDF
format. It is quite simple to use and handles most structures in GrADS
files. However, grads2nc currently does not support multi-file
templates, station data, GRIB data, and initial file headers. It assumes
the control file format for GrADS 1.5.x; older or newer versions may or
may not parse correctly, but they will probably be fine.
During conversion of a file, the output netCDF file's X and Y dimensions
are given a "units" attribute of "degrees_E" and "degress_N"
respectively. All the Z dimensions are given units of "level". All the
variables are given units of "unknown" since there is no consistent way
of extracting this information from the GrADS control file. The actual
data values are simply copied through to the netCDf file; they are not
modified in any way.
OPTIONS
infile.ctl
The input GrADS control file. The data file it references must also
be available.
outfile.nc
The output netCDF file.
-n Use the shell's setting for "NETCDF_FFIOSPEC", otherwise it will use
the built-in default of "cachea:896:2" (Cray only).
-r Finds the actual minimum and maximum values for each variable
instead of using the default "valid_range" of -1e+37 to 1e+37.
-v Verbose mode; print extensive progress information.
-q Quiet mode; no progress output.
SEE ALSO
http://www.gfdl.gov/~jps/GFDL_VG_NetCDF_Utils.html#grads2nc
http://www.gfdl.gov/~jps/GFDL_VG_2DPackages.html#GrADS
grads2nc uses John Sheldon's NCIR library to write the netCDF files:
http://www.gfdl.gov/~jps/GFDL_VG_NetCDF_Utils.html#NCIR
AUTHORS
Programming and design by Hans Vahlenkamp (hnv@gfdl.gov), NCIR library by
John Sheldon (jps@gfdl.gov) - Geophysical Fluid Dynamics Lab / NOAA,
Princeton University Forrestal Campus.
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