CDO

have you tested mergegrid?

The other option is the scatter-gather combination. I wanted to write an operator news feed for a long time, but didn't manage to do, yet. anyhow, the short answer is

• scatter,n,m split regular fields in n x m parts and
• gather is putting it all together again

here comes a litte example using the internal topography operator 'topo'

• cdo -f nc -topo topo.nc

• split in to 3x2 part with

  cdo -f nc scatter,3,2 topo.nc topo_scat

• results:

  -rw-rw-r-- 1 ram users  173K Nov 13 15:52 topo_scat00005.nc
  -rw-rw-r-- 1 ram users  173K Nov 13 15:52 topo_scat00004.nc
  -rw-rw-r-- 1 ram users  173K Nov 13 15:52 topo_scat00003.nc
  -rw-rw-r-- 1 ram users  173K Nov 13 15:52 topo_scat00002.nc
  -rw-rw-r-- 1 ram users  173K Nov 13 15:52 topo_scat00001.nc
  -rw-rw-r-- 1 ram users  173K Nov 13 15:52 topo_scat00000.nc
  

• now use cdo plotting operators

  for file in  topo_scat*nc; do cdo shaded,device=png -chname,topo,$file $file plot_$file; done

  with output

  -rw-rw-r-- 1 ram users   87K Nov 13 15:53 plot_topo_scat00000.nc_topo_scat00000.nc.png
  -rw-rw-r-- 1 ram users   94K Nov 13 15:53 plot_topo_scat00001.nc_topo_scat00001.nc.png
  -rw-rw-r-- 1 ram users   94K Nov 13 15:53 plot_topo_scat00002.nc_topo_scat00002.nc.png
  -rw-rw-r-- 1 ram users   88K Nov 13 15:53 plot_topo_scat00003.nc_topo_scat00003.nc.png
  -rw-rw-r-- 1 ram users   98K Nov 13 15:53 plot_topo_scat00004.nc_topo_scat00004.nc.png
  -rw-rw-r-- 1 ram users   88K Nov 13 15:53 plot_topo_scat00005.nc_topo_scat00005.nc.png
  

• check files with you favourite image viewer

should look like this:

Thank you, mergegrid worked. Because that command is not documented in the pdf I have, I was not aware it existed.

The html and pdf links at the wiki should always represent the latest documentation.