Re: [netcdfgroup] Converting record dimension to non-record dimension


Here is another method if NCO doesn't get it done. This is a trick to remove the "unlimited" characteristic on a named dimension. This method is relatively slow, but it has the advantage of simplicity and nothing new to install. This is in the general class of:

  ncdump | user hack | ncgen -o

Here is a specific example to remove unlimited. Change the dim name and integer value to match your file. C shell syntax:

  set str1 = 'time = UNLIMITED ; // (24350 currently)'
  set str2 = 'time = 24350 ;'
  ncdump | sed -e "s#^.$str1# $str2#" | ncgen -o

By the way, the whole file must *always* be rewritten at least once when changing "unlimited". Due to the internal structure of Netcdf 3 files, it is impossible to switch the unlimited characteristic on or off in place.

Dave Allured
CU/CIRES Climate Diagnostics Center (CDC)
NOAA/ESRL/PSD, Climate Analysis Branch (CAB)

Joe Sirott wrote:
Does anyone know of a utility that will convert a large netCDF file that has a record dimension to a file that contains no record dimension at all?

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