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	Eng ID	Term	Definition
	3641	orthometric correction	The CORRECTION to ELEVATIONS which takes into account the spheroidal shape of the EARTH and brings the ELEVATIONS to their true HEIGHT above... more The CORRECTION to ELEVATIONS which takes into account the spheroidal shape of the EARTH and brings the ELEVATIONS to their true HEIGHT above MEAN SEA LEVEL.
	3642	orthomorphic	(adj.). Preserving the correct shape; of a PROJECTION which gives no local DISTORTION. See PROJECTION: CONFORMAL.
	3643	orthomorphic projection	See PROJECTION: CONFORMAL.
	3644	orthophotograph	A photographic copy, prepared from a perspective PHOTOGRAPH, in which the DISPLACEMENTS of IMAGES due to TILT and RELIEF have been removed.
	3645	orthophotomap	A PHOTOMAP made from an assembly of ORTHOPHOTOGRAPHS. It may incorporate special cartographic treatment, photographic edge enhancement, c... more A PHOTOMAP made from an assembly of ORTHOPHOTOGRAPHS. It may incorporate special cartographic treatment, photographic edge enhancement, colour separation, or a combination of these.
	3646	orthophotomosaic	An assembly of ORTHOPHOTOGRAPHS forming a uniform-scale mosaic.
	3647	orthophotoscope	A photomechanical device, used in conjunction with a double-projection anaglyphic instrument, for producing ORTHOPHOTOGRAPHS.
	3648	oscillation	The variation, usually with time, of the magnitude of a quantity with respect to a specified reference when the magnitude is alternately gre... more The variation, usually with time, of the magnitude of a quantity with respect to a specified reference when the magnitude is alternately greater and smaller than the reference. Half an oscillatory CYCLE, consisting of a fluctuation or VIBRATION in one direction; half a VIBRATION.
	3649	oscillator	A device for producing OSCILLATIONS, especially one of the non-rotating type, as the sound generator of a sonic DEPTH FINDER or a radio fre... more A device for producing OSCILLATIONS, especially one of the non-rotating type, as the sound generator of a sonic DEPTH FINDER or a radio frequency generator. A submarine oscillator is a large, electrically-operated diaphragm horn which produces a SOUND for transmission through water.
	3650	oscillatory wave	See WAVE.
	3651	oscillograph	A device for recording or indicating OSCILLATIONS or changes in an electric current.
	3652	oscilloscope	A type of OSCILLOGRAPH that visually records an electrical WAVE on a fluorescent SCREEN, as of a CATHODE-RAY TUBE.
	3653	otter	Plane surface towed forward of its middle length so that it will incline and dive. Used in fishing, minesweeping or SURVEYING. See KITE, KIT... more Plane surface towed forward of its middle length so that it will incline and dive. Used in fishing, minesweeping or SURVEYING. See KITE, KITE OTTER, and OROPESA SWEEP.
	3654	outcrop	Naturally protruding, or erosionally exposed or uncovered part of a ROCK, most of which is covered by overlying material.
	3655	outer harbour	See HARBOUR.
	3656	outer limit	The extent to which a coastal State claims or may claim a specific jurisdiction in accordance with the provisions of International Law.
	3657	outfall diffuser	A structure on an outfall through which liquids are discharged. The structure will usually project above the level of the outfall and can b... more A structure on an outfall through which liquids are discharged. The structure will usually project above the level of the outfall and can be an obstruction to navigation.
	3658	outflow	The FLOW of water from the RIVER or its ESTUARY to the SEA. Total volume for any given period of time.
	3659	outgoing stream	See EBB STREAM.
	3660	output	The amount of power or energy produced by a machine.
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