NAME
ncrcat - netCDF Record Concatenator
SYNTAX
ncrcat [-3] [-4] [-6] [-A] [-C] [-c] [-D dbg] [-d dim,[ min][,[
max]][,[ stride]]] [-F] [-h] [-L dfl_lvl] [-l path] [-n loop] [-O] [-p
path] [-R] [-r] [-t thr_nbr] [-v var[,...]] [-X box] [-x] input-files
output-file
DESCRIPTION
ncrcat concatenates record variables across an arbitrary number of
input files. The final record dimension is by default the sum of the
lengths of the record dimensions in the input files.
Input files may vary in size, but each must have a record dimension.
The record coordinate, if any, should be monotonic (or else non-fatal
warnings may be generated). Hyperslabs of the record dimension which
include more than one file are handled correctly. ncra supports the
stride argument to the -d hyperslab option for the record dimension
only, stride is not supported for non-record dimensions.
ncrcat applies special rules to ARM convention time fields (e.g.,
time_offset).
EXAMPLES
Concatenate files 85.nc, 86.nc, ... 89.nc along the record dimension,
and store the results in 8589.nc:
ncrcat 85.nc 86.nc 87.nc 88.nc 89.nc 8589.nc
ncrcat 8[56789].nc 8589.nc
ncrcat -n 5,2,1 85.nc 8589.nc
These three methods produce identical answers.
Assume the files 85.nc, 86.nc, ... 89.nc each contain a record
coordinate time of length 12 defined such that the third record in
86.nc contains data from March 1986, etc. NCO knows how to hyperslab
the record dimension across files. Thus, to concatenate data from
December, 1985--February, 1986:
ncrcat -d time,11,13 85.nc 86.nc 87.nc 8512_8602.nc
ncrcat -F -d time,12,14 85.nc 86.nc 87.nc 8512_8602.nc
The file 87.nc is superfluous, but does not cause an error. The -F
turns on the Fortran (1-based) indexing convention.
The following uses the stride option to concatenate all the March
temperature data from multiple input files into a single output file
ncrcat -F -d time,3,,12 -v temperature 85.nc 86.nc 87.nc
858687_03.nc
Assume the time coordinate is incrementally numbered such that January,
1985 = 1 and December, 1989 = 60. Assuming ?? only expands to the
five desired files, the following concatenates June, 1985--June, 1989:
ncrcat -d time,6.,54. ??.nc 8506_8906.nc
AUTHOR
NCO manual pages written by Charlie Zender and Brian Mays.
REPORTING BUGS
Report bugs to <http://sf.net/bugs/?group_id=3331>.
COPYRIGHT
Copyright © 1995-2010 Charlie Zender
This is free software; see the source for copying conditions. There is
NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
SEE ALSO
The full documentation for NCO is maintained as a Texinfo manual called
the NCO User’s Guide. Because NCO is mathematical in nature, the
documentation includes TeX-intensive portions not viewable on
character-based displays. Hence the only complete and authoritative
versions of the NCO User’s Guide are the PDF (recommended), DVI, and
Postscript versions at <http://nco.sf.net/nco.pdf>,
<http://nco.sf.net/nco.dvi>, and <http://nco.sf.net/nco.ps>,
respectively. HTML and XML versions are available at
<http://nco.sf.net/nco.html> and <http://nco.sf.net/nco.xml>,
respectively.
If the info and NCO programs are properly installed at your site, the
command
info nco
should give you access to the complete manual, except for the TeX-
intensive portions.
HOMEPAGE
The NCO homepage at <http://nco.sf.net> contains more information.