This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Don- What you are seeing is the fact that netcdf4 files have a larger fixed overhead than netcdf3 files. To see this, change that dimension to 333333, for example, and you should see that the netcdf3 file is now about the same size as the netcdf4 file, partly because of how unlimited is handled and partly because of fill value handling. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: GPA-681302 Department: Support THREDDS Priority: Normal Status: Closed