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	Eng ID	Term	Definition
	1221	dark slide	See SLIDE: DARK.
	1222	data	A representation of facts, concepts or instructions in a formalised manner suitable for communication, interpretation or processing.
	1223	data bank	A collection of DATA in a common location, relating to a given set of subjects. Usually comprised of several DATA BASES considered as an ent... more A collection of DATA in a common location, relating to a given set of subjects. Usually comprised of several DATA BASES considered as an entity.
	1224	data base	An organised collection of DATA stored so as to be capable of use by relevant applications with the DATA being accessed by different logical... more An organised collection of DATA stored so as to be capable of use by relevant applications with the DATA being accessed by different logical paths. It should be application independent.
	1225	data base management system	A set of software for creating, maintaining and accessing the DATA of a DATA BASE.
	1226	data processing	Any operation carried out with data usually with the help of a computer.
	1227	data retrieval	The extraction of data which meet certain criteria from a FILE or DATA BANK.
	1228	data set	A logical entity of data consisting of several elements (fields) grouped under one criterion.
	1229	data telemetry	Measuring a quantity, and transmitting the measured value to a distant station where further processing takes place.
	1230	date line	The line coinciding approximately with the 180th MERIDIAN, at which each calendar day first begins, the BOUNDARY between the -12 and +12 TIM... more The line coinciding approximately with the 180th MERIDIAN, at which each calendar day first begins, the BOUNDARY between the -12 and +12 TIME ZONES. The date on each side of this line differs by one DAY, but the TIME is the same in these two ZONES. Sometimes called calendar line or international date line.
	1231	datum	Any numerical or geometrical quantity or set of such quantities which may serve as a reference or base for other quantities. In geodesy a da... more Any numerical or geometrical quantity or set of such quantities which may serve as a reference or base for other quantities. In geodesy a datum is defined by a set of parameters specifying the reference surface or the reference coordinate system. Therefore two types of datums are required: a horizontal datum which forms the basis for computations of horizontal control surveys in which the curvature of the earth is considered, and a vertical datum to which elevations are referred.
	1232	datum: chart	A permanently established surface from which SOUNDINGS or tide heights are referenced, usually LOW WATER. Also called DATUM, datum level, DA... more A permanently established surface from which SOUNDINGS or tide heights are referenced, usually LOW WATER. Also called DATUM, datum level, DATUM PLANE, hydrographic datum, reference level, reference plane. See DATUM: TIDAL.
	1233	datum: geodetic	A set of parameters specifying the reference surface or the reference coordinate system used for geodetic control in the calculation of coor... more A set of parameters specifying the reference surface or the reference coordinate system used for geodetic control in the calculation of coordinates of points on the earth. Commonly datums are defined as horizontal and vertical datums separately. For a local geodetic datum the reference surface is defined by five parameters: the LATITUDE and LONGITUDE of an INITIAL POINT, the AZIMUTH of a line from this point, and the parameters of the REFERENCE SPHEROID. Absolute datums specify the INITIAL POINT of the REFERENCE ELLIPSOID to be (ideally) located at the earth's centre of mass. For modern reference systems using datum information given by satellites additional parameters are defined, e.g. gravity models. See also HORIZONTAL CONTROL DATUM.
	1234	datum: levelling	See DATUM: VERTICAL CONTROL.
	1235	datum: sounding	The horizontal plane or TIDAL DATUM to which the SOUNDINGS on a HYDROGRAPHIC SURVEY are reduced. Also called datum for sounding reduction.
	1236	datum: tidal	A LEVEL of the SEA defined by some PHASE of the TIDE, from which water depths and HEIGHTS OF TIDE are reckoned.
	1237	datum: vertical control	Any LEVEL SURFACE (e.g., MEAN SEA LEVEL) taken as a surface of reference from which to reckon ELEVATIONS. Also called datum level, reference... more Any LEVEL SURFACE (e.g., MEAN SEA LEVEL) taken as a surface of reference from which to reckon ELEVATIONS. Also called datum level, reference level, reference plane, levelling datum, datum for heights. See also DATUM PLANE.
	1238	datum for heights	See DATUM: VERTICAL CONTROL.
	1239	datum for sounding	See DATUM: SOUNDING.
	1240	datum for sounding reduction	See DATUM: SOUNDING.
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