How to Upgrade netCDF-3 code to netCDF-4

16.3 How to Upgrade netCDF-3 code to netCDF-4

Adapting netCDF-3 code that writes data to netCDF-4 is also easy

For netCDF-3 programs that create netCDF files or write netCDF data:

Install latest netCDF release
If you only want to write classic or 64-bit offset format files, no code changes are necessary
To write netCDF-4 formats, change nc_create calls to include the appropriate "NC_NETCDF4" or "NC_NETCDF4 | NC_CLASSIC_MODEL" flag
Optionally, add control of performance features, such as chunking and compression for netCDF-4 format files
Recompile, relink, and run
Only classic model is handled without extra code