1NCRCAT(1) General Commands Manual NCRCAT(1)
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6 ncrcat - netCDF Record Concatenator
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9 ncrcat [-3] [-4] [-5] [-6] [-7] [-A] [--bfr sz_byt] [-C] [-c] [--cb
10 y1,y2,m1,m2,tpd] [--cmp cmp_sng] [--cnk_byt sz_byt] [--cnk_csh sz_byt]
11 [--cnk_dmn nm,sz_lmn] [--cnk_map map] [--cnk_min sz_byt] [--cnk_plc
12 plc] [--cnk_scl sz_lmn][-D dbg_lvl] [-d dim,[ min][,[ max]][,[
13 stride[[,[ subcycle[[,[ interleave]]]]]] [-F] [--fl_fmt=fmt] [-G
14 gpe_dsc] [-g grp[,...]] [--glb att_name= att_val]] [-h] [--hdr_pad
15 sz_byt] [-L dfl_lvl] [-l path] [--mro] [--msa] [-n loop] [--no_cll_msr]
16 [--no_frm_trm] [--no_tmp_fl] [-O] [-p path] [--ppc var1[, var2[,...]]=
17 prc]] [-R] [-r] [--ram_all] [--rec_apn] [-t thr_nbr] [--uio] [--unn]
18 [-v var[,...]] [-X box] [-x] input-files output-file
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21 ncrcat concatenates record variables across an arbitrary number of in‐
22 put files. The final record dimension is by default the sum of the
23 lengths of the record dimensions in the input files.
24 Input files may vary in size, but each must have a record dimension.
26 The record coordinate, if any, should be monotonic (or else non-fatal
27 warnings may be generated). Hyperslabs of the record dimension which
28 include more than one file are handled correctly. ncra supports the
29 stride argument to the -d hyperslab option for the record dimension
30 only, stride is not supported for non-record dimensions.
31 ncrcat applies special rules to ARM convention time fields (e.g.,
33 time_offset).
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36 Concatenate files 85.nc, 86.nc, ... 89.nc along the record dimension,
37 and store the results in 8589.nc:
38 ncrcat 85.nc 86.nc 87.nc 88.nc 89.nc 8589.nc
39 ncrcat 8[56789].nc 8589.nc
40 ncrcat -n 5,2,1 85.nc 8589.nc
41 These three methods produce identical answers.
42 Assume the files 85.nc, 86.nc, ... 89.nc each contain a record coor‐
44 dinate time of length 12 defined such that the third record in 86.nc
45 contains data from March 1986, etc. NCO knows how to hyperslab the
46 record dimension across files. Thus, to concatenate data from Decem‐
47 ber, 1985--February, 1986:
48 ncrcat -d time,11,13 85.nc 86.nc 87.nc 8512_8602.nc
49 ncrcat -F -d time,12,14 85.nc 86.nc 87.nc 8512_8602.nc
50 The file 87.nc is superfluous, but does not cause an error. The -F
51 turns on the Fortran (1-based) indexing convention.
52 The following uses the stride option to concatenate all the March tem‐
54 perature data from multiple input files into a single output file
55 ncrcat -F -d time,3,,12 -v temperature 85.nc 86.nc 87.nc
56 858687_03.nc
57 Assume the time coordinate is incrementally numbered such that January,
59 1985 = 1 and December, 1989 = 60. Assuming ?? only expands to the
60 five desired files, the following concatenates June, 1985--June, 1989:
61 ncrcat -d time,6.,54. ??.nc 8506_8906.nc
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65 ncrcat does not re-scale packed data (i.e., data stored using the
66 scale_factor and add_offset attributes recommended by the Unidat and CF
67 conventions. ncrcat just copies the data directly from the input
68 files. It copies the relevant metadata (i.e., scale_factor and
69 add_offset attributes) from the first file. Concatenating multiple
70 datasets packed with different scales is beyond its capabilities (con‐
71 catenating data packed with the same scales in multiple files works
72 fine). The workaround for cases where the scales change among files is
73 to first unpack the data in all the file using ncpdq, then to concate‐
74 nate the unpacked data using ncrcat, and finally to repack the result
75 using ncpdq.
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79 NCO manual pages written by Charlie Zender and originally formatted by
80 Brian Mays.
81
84 Report bugs to <http://sf.net/bugs/?group_id=3331>.
85
88 Copyright © 1995-present Charlie Zender
89 This is free software; see the source for copying conditions. There is
90 NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
91 PURPOSE.
92
95 The full documentation for NCO is maintained as a Texinfo manual called
96 the NCO Users Guide. Because NCO is mathematical in nature, the docu‐
97 mentation includes TeX-intensive portions not viewable on character-
98 based displays. Hence the only complete and authoritative versions of
99 the NCO Users Guide are the PDF (recommended), DVI, and Postscript ver‐
100 sions at <http://nco.sf.net/nco.pdf>, <http://nco.sf.net/nco.dvi>, and
101 <http://nco.sf.net/nco.ps>, respectively. HTML and XML versions are
102 available at <http://nco.sf.net/nco.html> and
103 <http://nco.sf.net/nco.xml>, respectively.
104 If the info and NCO programs are properly installed at your site, the
106 command
107 info nco
109 should give you access to the complete manual, except for the TeX-in‐
111 tensive portions.
112 ncap(1), ncap2(1), ncatted(1), ncbo(1), ncclimo(1), nces(1), ncecat(1),
114 ncflint(1), ncks(1), nco(1), ncpdq(1), ncra(1), ncrcat(1), ncremap(1),
115 ncrename(1), ncwa(1)
116
119 The NCO homepage at <http://nco.sf.net> contains more information.
120 NCRCAT(1)