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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
On Mon, Jan 13, 2014 at 12:11 PM, Russ Rew > record or unlimited dimension in place without having to rewrite the > > entire file. > > No, it requires rewriting. yes , but... > > In my case I have a bunch of 2D (lat, lon) or 3D (lon,lat,lev) plus time > > netcdf 4 files where time is the last dimension (1 time per file) that I > > want to concatenate with the nco utility. The files were created with > > time a fixed dimension of length one and are large and nco seems to be > > making a copy of the whole file when converting the time to an unlimited > > dimension. > If you are concatenating then you should be able to make a copy of only the first file, making a copy with the time dimension changed to unlimited, then add the others to that. Not sure of the NCO incantation to do that, but I'd be really surprised if it wasn't doable. A quick look art this docs: http://nco.sourceforge.net/nco.html#Concatenation) finds this: """ ncpdq makes it possible to concatenate files along any dimension, not just the record dimension. First, use ncpdq to convert the dimension to be concatenated (i.e., extended with data from other files) into the record dimension. Second, use ncrcat to concatenate these files. Finally, if desirable, use ncpdq to revert to the original dimensionality """ I think "record dimension" is the NCO name for unlimited dimension. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker@xxxxxxxx
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