If you have a file compressed with e.g. Zstandard, then the HDF5 library will automatically and dynamically load the filters used in the file. See this document https://support.hdfgroup.org/HDF5/doc/Advanced/DynamicallyLoadedFilters/HDF5DynamicallyLoadedFilters.pdf section 4.4. This means that netcdf-c inherits that functionality for reading. We are working on a standard way to make this api accessible thru the netcdf-c API when you want to write a compressed file. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: IBA-176704 Department: Support THREDDS Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.