ICE FLOW VELOCITY MAPPING IN GREENLAND USING HISTORICAL IMAGES FROM 1960s TO 1980s: SCHEME DESIGN
Keywords: Ice flow velocity, Greenland, Landsat images, DISP, Mapping, Glacier
Abstract. Ice flow velocity over long time series in Greenland plays a vital role in estimating and predicting the mass balance of the Greenland Ice Sheet and its contribution to global sea level rise. However, there are few Greenland ice flow velocity products with large spatial coverage available showing the Greenland ice flow velocity pattern before the 1990s. We proposed three methods, including parallax decomposition, grid-based NCC image matching, feature and gird-based image matching with constraints for estimation of surface velocity in East Antarctica based on ARGON KH-5 and LANDSAT imagery, and a systematic compilation method for the ice surface velocity in East Antarctica from the 1960s to 1980s. Based on the above methods and cartographic processes, this study designed a framework for the mapping of the historical ice flow velocity of the Greenland ice sheet. Currently, the early LANDSAT images covering several glaciers in North Greenland and Northwest Greenland have been processed and applied to velocity mapping using the cartographic process proposed in this study, and some preliminary results have been obtained.