Hydrographic survey in the context of End user

The second voyage of HMS Beagle, from 27 December 1831 to 2 October 1836, was the second survey expedition of HMS Beagle, made under her newest commander, Robert FitzRoy. FitzRoy had thought of the advantages of having someone onboard who could investigate geology, and sought a naturalist to accompany them as a supernumerary. At the age of 22, the graduate Charles Darwin hoped to see the tropics before becoming a parson, and accepted the opportunity. He was greatly influenced by reading Charles Lyell's Principles of Geology during the voyage. By the end of the expedition, Darwin had made his name as a geologist, and fossil collector, and the publication of his journal (later known as The Voyage of the Beagle) gave him wide renown as a writer.

Beagle sailed across the Atlantic Ocean, and then carried out detailed hydrographic surveys around the coasts of southern South America, returning via Tahiti and Australia, after having circumnavigated the Earth. The initial offer to Darwin told him the voyage would last two years; it lasted almost five.

Limits of Oceans and Seas (French: Limites des Océans et Mers or Limites des Océans et des Mers, S-23) is a special publication of the International Hydrographic Organization (IHO) defining the names and borders of the oceans and seas. The publication serves as an international standard for hydrographic surveying and nautical charting and is also consulted by others involved in maritime activities. It is authored by the organization's secretariat, the International Hydrographic Bureau (IHB), and approved by IHO member states. It only covers sea surface features; undersea features are standardized in another IHO publication, the GEBCO Gazetteer of Undersea Feature Names. It is slated to be replaced by a digital dataset by 2026.

Underwater divers may be employed in any branch of an armed force, including the navy, army, marines, air force and coast guard.Scope of operations includes: search and recovery, search and rescue, hydrographic survey, explosive ordnance disposal, demolition, underwater engineering, salvage, ships husbandry, reconnaissance, infiltration, sabotage, counterifiltration, underwater combat and security.

Real-time kinematic positioning (RTK) is the application of surveying to correct for common errors in current satellite navigation (GNSS) systems. It uses measurements of the phase of the signal's carrier wave in addition to the information content of the signal and relies on a single reference station or interpolated virtual station to provide real-time corrections, providing up to centimetre-level accuracy (see DGPS). With reference to GPS in particular, the system is commonly referred to as carrier-phase enhancement, or CPGPS. It has applications in land surveying, hydrographic surveying, and in unmanned aerial vehicle navigation.

A hydrographic office is an organization which is devoted to acquiring and publishing hydrographic information.

Historically, the main tasks of hydrographic offices were the conduction of hydrographic surveys and the publication of nautical charts. In many countries, various navigation-related services are now concentrated in large governmental organizations, sometimes termed "maritime administration" (however, the International Hydrographic Organization uses the term "hydrographic offices" for its member organizations).

The United States Lake Survey (USLS) was a hydrographic survey for the Great Lakes, New York Barge Canal, Lake Champlain and the Boundary Waters of the Canada–United States border between Minnesota and Ontario. The Survey's activities began on 31 March 1841, with the goal of surveying the Great Lakes. The Lake Survey was created within the United States Army Topographical Engineers (later the United States Army Corps of Engineers). Like the Commerce Department's United States Coast and Geodetic Survey, the Lake Survey had responsibility for the preparation and publication of nautical charts and other navigational aids. By 1882, the Survey had completed the original Congressional mandate, producing 76 charts, then disbanded. By 1901, the original survey and charting products required revision. The Lake Survey was reconstituted and its mission expanded. In addition to traditional survey, charting, and navigation information responsibilities, the Lake Survey was also responsible for studies on lake levels and associated river flow.

An isopach map (/ˈaɪsoʊpæk/) illustrates thickness variations within a tabular unit, layer or stratum. Isopachs are contour lines of equal thickness over an area. Isopach maps are utilized in hydrographic survey, stratigraphy, sedimentology, structural geology, petroleum geology and volcanology.

An isopach map is similar to an isochore map, but these terms actually describe different methods of displaying thickness variations within a layer.