Before revision: Seabed topography Measurement 250px|First printed map of oceanic bathymetry, produced with data from USS Dolphin (1853) Originally, bathymetry involved the measurement of ocean depth through depth sounding.
After revision: Seabed topography Measurement 250px|First printed map of oceanic bathymetry, published by Matthew Fontaine Maury with data from USS Dolphin (1853) Originally, bathymetry involved the measurement of ocean depth through depth sounding.