The ICESat-2 satellite, launched in 2018, was developed primarily to measure the surface elevation of polar ice sheets, but it can do much more than that. One of its other capabilities is determining water depths to as much as 40 meters. Thomas et al. used this ability, combined with remote optical imagery, to map the shallow seafloor in coastal areas of Florida, Crete, and Bermuda. This work demonstrates the viability of using ICESat-2 to help make global, space-borne estimates of nearshore bathymetry in shallow, clear water environments.
Geophys. Res. Lett. 10.1029/2020GL092170 (2021).