NSF’s Center for Remote Sensing of Ice Sheets, CReSIS, launched its field work March 31. As one of two major CReSIS efforts in 2009, a team flew over the ice sheet in a specially instrumented twin otter to collect airborne radar measurements, and map near-surface internal layers of ice with fine resolution of about 10 cm. The team collected data along and across the main channel of Jakobshavn Glacier, and on the Helheim and Kangerdlussuaq glaciers. This work aims to measure ice thickness, to map internal layers at depth, and to image the ice-bed interface. This work should be complete by the end of the month, prior to a mid-May field trip for CReSIS researchers doing seismic traverse work.