The KEA format provides an implementation of the GDAL specification within the the HDF5 file format.
"KEA is an image file format, named after the New Zealand bird, that provides a full implementation of the GDAL data model and is implemented within a HDF5 file. A software library, libkea, is used to access the file format. The format has comparable performance with existing formats while producing smaller file sizes and is already within active use for a number of projects within Landcare Research, New Zealand, and the wider community."
