I can change the resolution of a netCDF file to a coarser one by doing something like this: How do I go the other way? I.e. change resolution of coarser scale netCDF to finer scale? Answer Increasing resolution with NCO requires regridding, available in NCO 4.5.1+. This currently requires you have a SCRIP/ESMF-compliant mapfile, which can be generated from SCRIP-compliant