Overview of bathymetric data collection from the river in front of Bethel. Photo by R&M Consultants by Marta Kumle What is Hydrographic Surveying? Hydrographic surveys produce maps of an underwater area. They reveal the depths, physical features and objects on the bottom. Onshore topography is a 3D model of the shape of the land, based on measurements of locations and elevations. Underwater, bathymetry is the equivalent of topography: the elevation and contours of the ocean bottom, seafloor, lakebed, river bottom, reservoir basin or any other body of water.

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