Extended Data Fig. 2: Observation data density.
From: Ubiquitous acceleration in Greenland Ice Sheet calving from 1985 to 2022
The total length of terminus observation data within each glacier catchment is summed for each month of the time series, as a proxy for which glaciers are best observed and when. Colour is presented on a log scale, in which dark purple indicates a high density of data. Histograms along the top and side of the matrix show totals, indicating when observations are available and which glaciers are best sampled. We use data collected as early as 1972 to constrain our ice masks, but the data analysis presented in this paper begins in 1985.
