Hello Ghansham, CF conventions don't support groups either for gridded and point feature data. Also, CF clients should be able to handle netCDF-4 classic files so you don't really need to convert your files into netCDF-3 and you still can take advantage of some of the netCDF-4 features like chunking or compression. Groups might cause problems in CF compliant clients that don't support netcd-4 data model. Cheers! Ticket Details =================== Ticket ID: KRC-466779 Department: Support netCDF Java Priority: Critical Status: Open