Extended Data Fig. 3: Gridded datasets.
To quantify changes at the ice-sheet margins, where publicly available velocity and thickness datasets may not reach the maximum observed extents of the ice sheet, we combine all available data, then extrapolate thickness, velocity, and a mask of ice-shelf names in the direction of ice flow. Although the resulting grids fill the entire map, we only use thickness and velocity data close to the Antarctic periphery, wherever ice has been observed in at least one of the 24 mappings since 1997.
