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The standard measurement for underwater visibility is the distance at which a Secchi disc can be seen. The range of underwater vision is usually limited by turbidity. In very clear water visibility may extend as far as about 80m, [18] and a record Secchi depth of 79 m has been reported from a coastal polynya of the Eastern Weddell Sea ...
Underwater computer vision is a subfield of computer vision. In recent years, with the development of underwater vehicles ( ROV, AUV, gliders), the need to be able to record and process huge amounts of information has become increasingly important. Applications range from inspection of underwater structures for the offshore industry to the ...
While ocean color is a key theme of ocean optics, optics is a broader term that also includes the development of underwater sensors using optical methods to study much more than just color, including ocean chemistry, particle size, imaging of microscopic plants and animals, and more.
The largest model is the REMUS 6000 at 3.84 metres (12.6 ft) long and 71 centimetres (28 in) in diameter; it is named after its maximum diving depth of 6000m. [4] It can travel at speeds of up to 5 knots (9.3 km/h) and has an endurance of up to 22 hours. [4]
They include depth gauges for underwater diving and similar applications. A diving depth gauge is a pressure gauge that displays the equivalent depth below the free surface in water. The relationship between depth and pressure is linear and accurate enough for most practical purposes, and for many purposes, such as diving, it is actually the ...
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Artificial reef – Human-made underwater structure that functions as a reef; Artificial reefs in Japan – Underwater structures to increase sustainable fishing activities; Marine debris – Human-created solid waste in the sea or ocean; Multi-purpose reef – Underwater structure intended to produce surfable waves from prevailing swell
Another format considered part of underwater photography is the over/under or split image, a composition that includes roughly half above the surface and half underwater, with both in focus. One of the pioneers of the traditional technique was National Geographic photographer David Doubilet , who used it to capture scenes above and below the ...