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Qu'est-ce (qui) est Datum nicht festgelegt - définition

POINT OF REFERENCE AGAINST WHICH SOME OTHERS ARE CALCULATED

Datum references; Engineering datum

Vertical datum

REFERENCE SURFACE FOR VERTICAL POSITIONS

Zero-elevation surface; Mean gravity surface; Reference height; Vertical reference system; Height datum; Zero-level elevation; Height system

In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum, is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation.

https://en.wikipedia.org/wiki/Vertical_datum

Ordnance datum

VERTICAL DATUM USED AS THE BASIS FOR DERIVING ALTITUDES ON MAPS

Ordinance Datum; Ordnance Datum Newlyn; Belfast ordnance datum; Malin ordnance datum; Poolbeg ordnance datum; Tunnel Datum; Above Ordnance Datum; Ordnance Datum

In the British Isles, an ordnance datum or OD is a vertical datum used by an ordnance survey as the basis for deriving altitudes on maps. A spot height may be expressed as AOD for "above ordnance datum".

https://en.wikipedia.org/wiki/Ordnance_datum

Geodetic datum

REFERENCE FRAME USED IN GEODESY, SURVEYING, CHARTOGRAPHY AND NAVIGATION

Datum (geodesy); Geographic datum; Geodectic Datum; Map datum; Geodetic origin; Geodetic Coordinate System; Geodesic datum; East North Up; Geodetic reference system; Geodetic system; Horizontal datum; Mapping datum; Geodetic datums; Geodetic reference frame

A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame) is a global datum reference or reference frame for precisely representing the position of locations on Earth or other planetary bodies by means of geodetic coordinates. DatumsThe plural is not "data" in this case are crucial to any technology or technique based on spatial location, including geodesy, navigation, surveying, geographic information systems, remote sensing, and cartography.

https://en.wikipedia.org/wiki/Geodetic_datum

Wikipédia

Datum reference

A datum reference or just datum (plural: datums) is some important part of an object—such as a point, line, plane, hole, set of holes, or pair of surfaces—that serves as a reference in defining the geometry of the object and (often) in measuring aspects of the actual geometry to assess how closely they match with the nominal value, which may be an ideal, standard, average, or desired value. For example, on a car's wheel, the lug nut holes define a bolt circle that is a datum from which the location of the rim can be defined and measured. This matters because the hub and rim need to be concentric to within close limits (or else the wheel will not roll smoothly). The concept of datums is used in many fields, including carpentry, metalworking, needlework, geometric dimensioning and tolerancing (GD&T), aviation, surveying, geodesy (geodetic datums), and others.

https://en.wikipedia.org/wiki/Datum reference