In 1991, a research effort to measure the surface elevation of the Greenland ice sheet was begun in support of a global climate study. Airborne laser altimetry data were collected and subsequent analysis showed that the surface elevation could be determined with an accuracy of about 20 cm [Krabill et al., 1995a, 1995b]. The University of Kansas has been involved in the measurement of the Greenland ice sheet thickness since 1993. In 1993, the airborne program was expanded to include a 150 MHz radar echo sounder developed and operated by The University of Kansas to measure the ice thickness. Since the summer of 1993, the radar depth sounder has collected ice-thickness data concurrent with the laser altimeter and other location measurement instruments.

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