1. Cryospheric Sciences Laboratory NASA Goddard Space Flight Center Greenbelt MD USA
2. Department of Space Studies Southwest Research Institute Boulder CO USA
3. Geophysical Institute University of Alaska Fairbanks Fairbanks AK USA
4. ADNET Systems, Inc. Lanham MD USA
5. Centre for GeoGenetics, Natural History Museum University of Copenhagen Copenhagen Denmark
6. Center for Remote Sensing of Ice Sheets The University of Kansas Lawrence KS USA