A datum reference or just datum (plural: datums) is some geometrically important part of an object—such as a point, line, plane, hole, set of holes, or...

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

with North American Datum of 1983 (NAD 83), is set to be replaced in 2025 with a new geometric reference frame and geopotential datum, based on GPS and...

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

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...

The North American Datum (NAD) is the horizontal datum now used to define the geodetic network in North America. A datum is a formal description of the...

or more 'datum references' which indicate measurements that should be made with respect to the corresponding datum feature. The datum reference frame can...

Centripetal force Classical mechanics Coriolis force Curvilinear coordinates Datum reference Dynamics (physics) Frenet–Serret formulas Galilean invariance General...

heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. Common chart datums are lowest astronomical...

The reference is said to refer to the datum, and accessing the datum is called dereferencing the reference. A reference is distinct from the datum itself...

American Vertical Datum of 1988 (NAVD 88), based upon reference to a single benchmark (referenced to the new International Great Lakes Datum of 1985 local...

position reported in a modern datum usually cannot be misunderstood as using an old datum, and vice versa – provided the datums use different MGRS lettering...

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...

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...

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...

Vertical reference frame a standard reference system for measuring elevation using vertical datums, based on levelling, a geoid model, or a chart datum (considering...

NAP markers in Amsterdam Amsterdam Ordnance Datum or Normaal Amsterdams Peil (NAP) is a vertical datum in use in large parts of Western Europe. Originally...

altitude. Both types of datum bind a mathematical model of the shape of the earth (usually a reference ellipsoid for a horizontal datum, and a more precise...

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

Collilieux ETRS89 is the EU-recommended frame of reference for geodata for Europe. It is the only geodetic datum to be used for mapping and surveying purposes...

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

The SK-42 reference system also known as the Krasovsky 1940 ellipsoid, is a coordinate system established in the Soviet Union in 1942 as Systema koordinat...

maps. A datum transformation exists between GRS36 and more recent geocentric frames (see below). OSGB36 is based on the Airy ellipsoid, a reference ellipsoid...

item of data. Geodetic datum, a standard position or level that measurements are taken from in geographic surveying Datum reference, in carpentry, metalworking...

vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to the context (e...

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

datum and a projection system. In some documents it is called Greek Geodetic Reference System 1987 or GGRS87. HGRS87 specifies a non-geocentric datum...

pistol. The cartridge headspaces on the mouth of the case at the L3 datum reference. According to Commission internationale permanente pour l'épreuve des...

the datum ellipsoidal coordinates and height onto a flat surface of a map. The datum, along with a map projection applied to a grid of reference locations...

The South American Datum (SAD) is a regional historical geodetic datum for South America. The most common version was established in 1969 (SAD69), as...