Question

I am having trouble trying to combine three files to be averaged. I am not so sure how to even start. I have three files

"nday1.06.nc , nday1.07.nc, nday.08.nc"

each with the variables

"filling on), ('SST', <class 'netCDF4._netCDF4.Variable'>
          float32 SST(time, nlat, nlon)
              long_name: Surface Potential Temperature
              units: degC
              coordinates: TLONG TLAT time
              grid_loc: 2110
              cell_methods: time: mean time: mean time: mean
              _FillValue: 9.96921e+36
          missing_value: 9.96921e+36
          unlimited dimensions: time
          current shape = (1, 2400, 3600)

I just need to average the SST variables and then an output file with the averages. I need to do this using linux NCO operators for netCDF4 files.

Answer 1

# Hey, dear You should try ncra not ncwa

ncra nday1.06.nc nday1.07.nc nday.08.nc out.nc

In python it will work as .nc file , and i suggest you to upgrading to latest NCO.

heres the syntax for-

ncra netCDF Record Averager

ncra [-3] [-4] [-5] [-6] [-7] [-A] [-C] [-c] [--cb]

[--cnk_byt sz_byt] [--cnk_csh sz_byt] [--cnk_dmn nm,sz_lmn]
[--cnk_map map] [--cnk_min sz_byt] [--cnk_plc plc] [--cnk_scl sz_lmn]
[-D dbg] [-d dim,[min][,[max][,[stride][,[subcycle]]]] [-F] [--fl_fmt fl_fmt]
[-G gpe_dsc] [-g grp[,…]] [--glb ...]
[-h] [--hdf] [--hdr_pad nbr] [--hpss] 
[-L dfl_lvl] [-l path] [--mro] [-N] [-n loop] 
[--no_cll_msr] [--no_cll_mth] [--no_frm_trm] [--no_tmp_fl] 
[-O] [-o output-file] [-p path] [--ppc ...] [-R] [-r] [--ram_all] [--rec_apn] [--rth_dbl|flt]
[-t thr_nbr] [--unn] [-v var[,…]] [-w wgt] [-X ...] [-x] [-y op_typ]
[input-files] [output-file]

i hope this will help to solve your problem ..Thank you..!!