Hydrographic survey

Neptune, a privately owned survey ship based in Chicago, Illinois.

A U.S. Coast and Geodetic Survey diagram of wire-drag hydrographic survey operations, ca. 1920. The basic principle is to drag a wire attached to two vessels at a set depth; if the wire encounters an obstruction it will come taut and form a

Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/offshore oil drilling and related activities. Strong emphasis is placed on soundings, shorelines, tides, currents, seabed and submerged obstructions that relate to the previously mentioned activities. The term hydrography is l used synonymously to describe maritime cartography, which in the final stages of the hydrographic process uses the raw data collected through hydrographic survey into information usable by the end user.

单词	Wire drag survey
释义	Wire drag survey 英语百科 Hydrographic survey Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/offshore oil drilling and related activities. Strong emphasis is placed on soundings, shorelines, tides, currents, seabed and submerged obstructions that relate to the previously mentioned activities. The term hydrography is l used synonymously to describe maritime cartography, which in the final stages of the hydrographic process uses the raw data collected through hydrographic survey into information usable by the end user.
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Wire drag survey

Hydrographic survey