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	Eng ID	Term	Definition
	2541	International Union of Geodesy and Geophysics (IUGG)	Promotes the study of all problems relating to the configuration and physics of the earth, its oceans and atmosphere; comprises a number of ... more Promotes the study of all problems relating to the configuration and physics of the earth, its oceans and atmosphere; comprises a number of international associations.
	2542	International Union of Geological Sciences (IUGS)	Contributes to the advancement of investigations relating to the study of the Earth.
	2543	International Union of Pure and Applied Physics (IUPAP)	Creates and encourages international cooperation in physics; secures international agreement on symbols, units, nomenclature, and standar... more Creates and encourages international cooperation in physics; secures international agreement on symbols, units, nomenclature, and standards.
	2544	International voyage	A voyage from a country to which the 1974 SOLAS convention applies to a port outside that country or conversely (SOLAS Chapter 1, Regulation... more A voyage from a country to which the 1974 SOLAS convention applies to a port outside that country or conversely (SOLAS Chapter 1, Regulation 2d).
	2545	International waters	A nonlegal term that refers to those waters subject to the high seas freedom of navigation and overflight, i.e., contiguous zone, EEZ, and h... more A nonlegal term that refers to those waters subject to the high seas freedom of navigation and overflight, i.e., contiguous zone, EEZ, and high seas.
	2546	interocular distance	See INTERPUPILLARY DISTANCE.
	2547	interpolation	The process of determining intermediate values between given values in accordance with some known or assumed rate or system of variation.
	2548	interpupillary distance	The distance between centres of the eye pupils of an individual. Also called eye base,and used interchangeable with interocular distance.
	2549	interrogator	A radar transmitter which sends out a PULSE that triggers a TRANSPONDER. An interrogator is usually combined in a single unit with a RESPONS... more A radar transmitter which sends out a PULSE that triggers a TRANSPONDER. An interrogator is usually combined in a single unit with a RESPONSOR, which receives the reply from a TRANSPONDER and produces an OUTPUT suitable for feeding to a display system, the combined unit being called an interrogator-responsor. Short for interrogator-responsor. Also called challenger.
	2550	interrogator-responsor	See INTERROGATOR and RESPONSOR.
	2551	intersected point	See STATION: INTERSECTION.
	2552	intersection	In SURVEYING, the procedure of determining the horizontal POSITION of an unoccupied point (INTERSECTION STATION) by direction observations... more In SURVEYING, the procedure of determining the horizontal POSITION of an unoccupied point (INTERSECTION STATION) by direction observations from two or more known POSITIONS. In PHOTOGRAMMETRY, the procedure of determining the horizontal POSITION of a point by intersecting lines of direction obtained photogrammetrically. The lines of direction may be obtained directly from VERTICAL PHOTOGRAPHS or by graphic or mathematical rectification of tilted PHOTOGRAPHS.
	2553	intersection station	See STATION.
	2554	intertidal zone	The zone generally considered to be between MEAN HIGH WATER and MEAN LOW WATER levels.
	2555	intertropical convergence zone	The zone which separates the trade winds.
	2556	intervalometer	A timing device for automatically operating the SHUTTER of a CAMERA at selected intervals.
	2557	invar	An alloy of nickel and steel which has a low coefficient of expansion.
	2558	invar tape	See TAPE.
	2559	invar wire	See WIRE.
	2560	inverse Mercator projection	See PROJECTION.
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