Ice bed topography mapping using InSAR and tomographic processes

Three-dimensional topographic maps of the bed 2.5 km beneath the Greenland ice sheet in a 10-km × 10-km region centered on the NEEM drill site (77.45°N 51.06°W) are produced using different processes - interpolation, interferometry, and tomography. Descriptions of the data collection and processing are followed by the terrain maps which are compared. Effects of basal slope and roughness on basal backscattering were modeled in an attempt to highlight the contribution of bed wetness variations in basal SAR intensity maps.