> VisAD seems to be the only open source Java tool that supports access to
> HDF-EOS files.
> Does it support HDF-EOS file creation and writing as well as reading?
Sorry to say that it does not. VisAD support for netCDF files
is much more robust, and does support creating and writing
files. We generally prefer the netCDF file format. For large
data sets we also advocate server protocols like OpenDAP and
ADDE, enabling clients to download only those parts of large
files that they need.