Data Availability Statement
Data compiled for figures 1 and 2 of this manuscript are provided through Harvard Dataverse: https://doi.org/10.7910/DVN/SOFZR7. Pre-IceBridge and IceBridge altimetry data, and MEaSUREs velocity data were downloaded from the National Snow and Ice Data Center at: https://nsidc.org/data/BLATM2/versions/1, https://nsidc.org/data/ILATM2/versions/2, and https://nsidc.org/data/NSIDC-0720/versions/1. Velocity data generated using auto-RIFT (Gardner et al., 2018) and provided by the NASA MEaSUREs ITS_LIVE project (Gardner et al., 2019) were downloaded from the following repository: https://github.com/nasa-jpl/its_live. Landsat images were downloaded from https://earthexplorer.usgs.gov. Figures were made with Matplotlib version 3.4.3, available under the Matplotlib license at https://matplotlib.org/.