Bathymetry is the study and measurement of underwater depth of ocean floors, riverbeds, lakes, and other bodies of water. It involves mapping the sea floor or the floor of other bodies of water to understand the underwater terrain and features, such as valleys, mountains, and plateaus. Bathymetric data is typically collected using sonar systems, which can send sound waves from a vessel to the bottom of the water body.
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The depth and shape of an underwater surface. Its variation affects seismic travel times and the water-column contribution to a marine gravity anomaly.