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	Eng ID	Term	Definition
	4301	reduced latitude	See LATITUDE: PARAMETRIC.
	4302	reduction	The process of substituting for an observed value one derived therefrom.
	4303	reduction of soundings	The CORRECTION of the observed DEPTHS, for the HEIGHT OF TIDE above or below the plane of reference at the TIME of SOUNDING. Usually the ter... more The CORRECTION of the observed DEPTHS, for the HEIGHT OF TIDE above or below the plane of reference at the TIME of SOUNDING. Usually the term reduction of soundings does not cover CORRECTIONS other than those due to TIDE. See CORRECTION OF SOUNDINGS, LEAD LINE CORRECTION and TIDE REDUCER.
	4304	reduction of tides	The processing of observed tidal data to obtain mean values of TIDAL CONSTANTS.
	4305	reduction to centre	The amount which must be applied to a DIRECTION observed at an ECCENTRIC STATION, or to an ECCENTRIC SIGNAL, to reduce such DIRECTION to wha... more The amount which must be applied to a DIRECTION observed at an ECCENTRIC STATION, or to an ECCENTRIC SIGNAL, to reduce such DIRECTION to what it would be if there were no such ECCENTRICITY.
	4306	reduction to sea level	A reduction applied to a measured horizontal length on the EARTH's surface to reduce it to the surface of the SEA LEVEL DATUM.
	4307	reduction to the meridian	The process of applying a CORRECTION to an ALTITUDE observed when a body is near the CELESTIAL MERIDIAN of the observer, to find the ALTITUD... more The process of applying a CORRECTION to an ALTITUDE observed when a body is near the CELESTIAL MERIDIAN of the observer, to find the ALTITUDE at MERIDIAN TRANSIT. See ALTITUDE: EX-MERIDIAN.
	4308	reed horn	A HORN that produces SOUND by means of a steel reed vibrated by air under pressure.
	4309	reef	A mass of rock or coral which either reaches close to the sea surface or is exposed at low tide, posing a hazard to NAVIGATION.
	4310	reef flat	A flat expanse of dead reef rock which is partly or entirely dry at LOW TIDE.
	4311	reference direction	A DIRECTION used as a basis for comparison of other DIRECTIONS.
	4312	reference ellipsoid	See REFERENCE SPHEROID.
	4313	reference level	See DATUM: CHART and DATUM: VERTICAL CONTROL.
	4314	reference line	Any line which can serve as a reference or base for the measurement of other quantities. Also called datum line.
	4315	reference mark	In SURVEYING, a supplementary MARK of permanent character close to a STATION or to a BASE TERMINAL, to which it is related by an accurately ... more In SURVEYING, a supplementary MARK of permanent character close to a STATION or to a BASE TERMINAL, to which it is related by an accurately measured distance and DIRECTION, and/or a difference in ELEVATION.
	4316	reference object	A well-defined object selected as a starting point in the DIRECTION METHOD OF OBSERVATION.
	4317	reference plane	See DATUM: CHART, and DATUM: VERTICAL CONTROL.
	4318	reference point	Any point which can serve as a reference or base for the measurement of other quantities. Also called datum point.
	4319	reference spheroid (or ellipsoid)	A theoretical figure whose dimensions closely approach the dimensions of the GEOID. The exact dimensions are determined by various conside... more A theoretical figure whose dimensions closely approach the dimensions of the GEOID. The exact dimensions are determined by various considerations of the section of the EARTH's surface considered. The SPHEROIDS of Bessel, Clarke, Delambre, Everest, Hayford, Helbert and others have been adopted as reference spheroids in geodetic work by different countries. Also called spheroid of reference, or ellipsoid of reference. See also SPHEROID: OBLATE.
	4320	reference station	See STATION.
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