Welcome to the HDF4
The latest Official Release of HDF is Current Release: HDF 4.2.1314
HDF4 (also known as HDF) is a library and multiand multi-object file format for storing and managing data between machines. There are two versions of HDF technologies that are completely different: HDF4 and HDF5. HDF4 is the first HDF format.PLEASE NOTE that although HDF4 is still funded, new
Although The HDF Group maintains HDF4 by fixing defects and porting it to new operating environments, there is no longer any new development occurring. HDF4 is considered deprecated and new products should be developed in HDF5 . See this FAQ
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