geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as...

Australian Height Datum was introduced in 1971 as the official vertical datum for Australia, and thereby serves as the benchmark to which all height measurements...

In aviation, reference datum height (RDH) is the height of a point, located above the intersection of the runway centre line and the threshold, through...

geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame)...

fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value,...

chart datum. Some height values on charts, such as vertical clearances under bridges or overhead wires, may be referenced to a different vertical datum, such...

Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a...

An ordnance datum (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 above...

level height value), although many cities and U.S. Army Corps of Engineers "legacy" projects with established data continued to use the older datum. Mean...

longer used as a reference point. Above mean sea level Normalnull – German height reference system derived from Amsterdam Ordnance Datum Normalhöhennull...

ellipsoidal height, reckoned from the surface of a reference ellipsoid, see Geodetic system, vertical datum. In aviation terminology, the terms height, altitude...

2008. Height above mean sea level (AMSL) is the elevation (on the ground) or altitude (in the air) of an object, relative to a reference datum for mean...

2010. ECEF datum transformation Archived March 22, 2007, at the Wayback Machine Notes on converting ECEF coordinates to WGS-84 datum Datum Transformations...

Geodetic datum § Vertical datum). The term elevation is mainly used when referring to points on the Earth's surface, while altitude or geopotential height is...

the vertical datum that approximates mean sea level. Orthometric height is one of the scientific formalizations of a layman's "height above sea level"...

applications, a geodesic reference ellipsoid is the mathematical model used as foundation by spatial reference system or geodetic datum definitions. In geophysics...

compound: 2D geographic ETRS89 + EVRF2019 height (mean-tide) WGS 84 ED50 AFREF Degrees minutes seconds (DMS) Geodetic datum KMZ file, a zipped KML file Latitude...

(AGL, AMSL, HAE, AAT) indicate where the "zero level" or "reference altitude" – the vertical datum – is located. A pilot flying an aircraft under instrument...

The geoid is often expressed as a geoid undulation or geoidal height above a given reference ellipsoid, which is a slightly flattened sphere whose equatorial...

vertical datum used in Germany. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence height above mean...

coordinate values for one or more datum points. In the case of height data, it suffices to choose one datum point — the reference benchmark, typically a tide...

longitude, and height to precisely measure actual locations on the physical earth, a geodetic datum must be used. A horizonal datum is used to precisely...

object by using the underside of the scriber as the datum. The datum may be permanently fixed or the height gauge may have provision to adjust the scale, this...

Geopotential heights are referenced to Earth's mean sea level, taking its best-fitting equigeopotential as a reference surface or vertical datum. In SI units, a...

projections all referenced to the same geodetic datum. A geographic coordinate transformation is a translation among different geodetic datums. Both geographic...

the large geodetic systems, such as European Datum (ED50), North American Datum (NAD), and Tokyo Datum (TD), to provide a worldwide geo-data basis Need...

survey points with reference to a common assumed vertical datum. It is a vertical distance between survey point and adopted datum surface. Thus, it is...

American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88) with a new geometric reference frame and geopotential datum. In association...

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object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure...