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Eng ID Term Definition
2481
instrumental (or instrument) correction
That CORREC­TION due to INSTRUMENTAL ERROR.
2482
instrumental (or instrument) error
See ERROR.
2483
instrumental (or instrument) parallax
See PARAL­LAX.
2484
insular
Of or pertaining to an island or islands.
2485
insular shelf
A zone around an island that extends from the low water line to a depth at which there is usually a marked increase of slope towards oceanic... more
A zone around an island that extends from the low water line to a depth at which there is usually a marked increase of slope towards oceanic depths.
2486
insulated (or insulating) water bottle
See WATER BOTTLE.
2487
INT1
The compendium of symbols, abbreviations and terms to be used on paper and raster NAUTICAL CHARTS, for use principally as a reference by ma... more
The compendium of symbols, abbreviations and terms to be used on paper and raster NAUTICAL CHARTS, for use principally as a reference by mariners, as derived from the "Regulations of the IHO for International (INT) Charts and Chart Specifications of the IHO" (IHO S-4).
2488
intake
The place where water is taken into a channel or pipe from a RIVER or other body of water, to drive a mill, or supply a CANAL, waterworks, e... more
The place where water is taken into a channel or pipe from a RIVER or other body of water, to drive a mill, or supply a CANAL, waterworks, etc.
2489
intended track
See TRACK.
2490
intensity: luminous (in a direction)
Quotient of the LUMINOUS FLUX emitted by a source, or by an element of a source in an infinitesimal cone containing the given direction, by ... more
Quotient of the LUMINOUS FLUX emitted by a source, or by an element of a source in an infinitesimal cone containing the given direction, by the solid angle of that cone.
2491
intensity: magnetic
See MAGNETIC FIELD INTENSITY.
2492
intensity: sound
At a point, the average rate of sound energy transmitted in a specified direction through a unit area normal to this direction at the point ... more
At a point, the average rate of sound energy transmitted in a specified direction through a unit area normal to this direction at the point consi­dered. The square of the SOUND PRESSURE.
2493
intensity of gravity
See GRAVITY.
2494
intensity of magnetization
See MAGNETIZATION.
2495
intercardinal point
Any of the four directions midway between the CARDINAL POINTS: north-east, north-west, south-east, south-west.
2496
intercept
The name given in MARCQ ST. HILAIRE METHOD to the difference between the calculated ALTITUDE and the TRUE ALTITUDE of a CELESTIAL BODY. Also... more
The name given in MARCQ ST. HILAIRE METHOD to the difference between the calculated ALTITUDE and the TRUE ALTITUDE of a CELESTIAL BODY. Also called altitude difference.
2497
intercept method
See MARCQ ST. HILAIRE METHOD.
2498
interface
A surface, usually plane, forming the BOUN­DARY between adjacent solids, spaces or immiscible liquids. In data processing it describes all i... more
A surface, usually plane, forming the BOUN­DARY between adjacent solids, spaces or immiscible liquids. In data processing it describes all information (signals, data) and the specifications ("protocol") required for exchanging data between two units of a system. Interfaces exist between hardware and software units but also between computer and human user.
2499
interference
Extraneous SIGNALS, NOISES, etc., that hinder proper reception of the desired SIGNAL in electronic equipment. See WAVE INTERFERENCE.
2500
interferometric echo sounder
A type of SWATH(E) SOUNDING SYSTEM in which the equipment emits a timed PULSE of sound that is narrow in the fore-aft direction and wide in ... more
A type of SWATH(E) SOUNDING SYSTEM in which the equipment emits a timed PULSE of sound that is narrow in the fore-aft direction and wide in the across-track direction. The system samples the reflected sound hundreds or even thousands of times for each emission. For each sample, the PHASE difference of the reflected sound arriving at two (or more) RECEIVERs located a known distance apart is measured and used to compute the ACOUSTIC angle of arrival.  Also, the time difference between the emission and reception for each sample is converted to a RANGE.  Geometry is then used to convert each RANGE and angle to DEPTHs and also to position these DEPTHs within the SWATH(E) on the SEAFLOOR.