Data are free, however if you plan to use them, we would appreciate being informed about your name and institution. For any publication, please cite this website as the source of the data, as well as the Laboratoire of Glaciology (LGGE) for credits.
As for the DEM data, if you are interested in the tabular data (X,Y,Z), please contact the responsible for the SPIRIT project (mail)
The airborne radar data are already available at this page. You can also directly contact Duncan Young (mail) for more information on these data.