Storstrømmen, Northeast Greenland - speed - grounding lines - ice fronts

The datasets describe the ice speed, grounding line positions and ice fronts of Storstrømmen and L. Bistrup Bræ located in Northeast Greenland. This data set consists of GeoTIFF (.tif) for the speed maps and ESRI shapefiles (.shp, .shx, .dbf, .prj) for the grounding lines and ice fronts.Surface ice velocity derived from feature or speckle tracking using declassified CORONA images from August 1967 and March 1968, Landsat-1&2/MSS images between 1973 and 1976, orthorectified American HEXAGON spy image acquired in1978 and 1982, Landsat-4&5/TM image pairs between 1984 and 1991, ERS-1/2 in 1993. GeoTIFF speed data are provided on polar stereographic projection. The file naming convention is first acquisition date (date1) followed by the second acquisition date (date2) and velocity component along x or y axis. (vx or v). Example : 19931231-19940118_vy.tif where date1=19931231, date2=19940118 and vy is the displacement along the y-axis.Grounding Lines position using InSAR data from the European Earth Remote Sensing (ERS-1/2) radar satellite collected in 1992 (3-day repeat cycle), in 1996 (1-day apart) and Sentinel-1a/b in Nov. 2015 and Apr. 2017. To digitize the grounding lines, we pick the inward limit of detection of vertical motion, where the glacier becomes afloat with a precision of about 50 m, as in Rignot et al., 2011.Ice fronts position between 1907 and 2015 from historical maps, aerial and satellite imagery.