2017/11/21 by IAN JOUGHIN, Ian Joughin, BEN E. SMITH +3 · 17 citations
Earth and Planetary Sciences · Medicine · #Cryospheric studies and observations #Arctic and Antarctic ice dynamics #Winter Sports Injuries and Performance
paper · pdf · doi:10.1017/jog.2017.73
ABSTRACT While numerous maps of Greenland ice flow velocity exist, most have gaps in coverage and/or accuracy is limited. We processed a large volume of synthetic aperture radar and Landsat 8 imagery collected between 1995 and 2015 to produce a nearly complete map of ice flow velocity for Greenland at a far greater accuracy than most prior products. We evaluated the accuracy of this map by comparing it with a variety of measured and estimated velocities. For the slow-moving interior of the ice sheet, where estimates are determined from interferometric phase, the errors are ~2 m a −1 or better. For coastal areas, where estimates are determined entirely from speckle- or feature-tracking methods, errors are 2–3 m a −1 , which is in good agreement with the estimated formal errors. Especially for the slow-moving majority of the ice sheet, this map provides an important source of data for numerous types of glaciological studies.