noun
bathymetry; sounding
Technical term for measuring water depth, used in hydrography, oceanography, and navigation.
深浅測量によって海底の地形が明らかになった。
Bathymetric surveys revealed the topography of the seafloor.
港湾整備の前に深浅測量が行われた。
A depth sounding was conducted before the port development.
測深 is a more general term for depth measurement, while 深浅測量 specifically refers to bathymetric surveying.
Compound of 深浅 (depth, deep and shallow) and 測量 (survey, measurement). A straightforward technical term.