reference datum height
1ILS (instrument landing system) reference datum — The point at a specified height that is located vertically above the intersection of the runway centerline and the threshold and through which the downward extended straight portion of the glide path passes …
2Datum (geodesy) — Geodesy Fundamentals Geodesy · …
3Height — is the measurement of vertical distance, but has two meanings in common use. It can either indicate how tall something is, or how high up it is. For example one could say That is a tall building , or That airplane is high up in the sky . These… …
4Reference ellipsoid — In geodesy, a reference ellipsoid is a mathematically defined surface that approximates the geoid, the truer figure of the Earth, or other planetary body.Because of their relative simplicity, reference ellipsoids are used as a preferred surface… …
5height — i. The vertical distance of a level, a point or an object considered as a point, measured from a specified datum (ICAO). Height may be indicated as follows: (all above ground level) very low above ground level but below 500 ft; low 500 up to 2000 …
6North American Vertical Datum of 1988 — Geodesy Fundamentals Geodesy · …
7Regional Reference Frame Sub-Commission for Europe — Infobox Union name= EUREF country= affiliation= International Association of Geodesy members= more than 30 countries full name= Regional Reference Frame Sub Commission for Europe native name= founded= 1987 current= head= dissolved date= dissolved …
8Sea Level Datum of 1929 — Geodesy Fundamentals Geodesy · …
9Ordnance 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 . Usually mean sea level (MSL) is used for… …
10Orthometric height — The orthometric height is the distance H along a line of force from a given point P at the physical surface of an object to the geoid. Orthometric heights are what are usually used in the US for ordinary engineering work. Values for measured… …
