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Elevation or altitude is generally expressed as "metres above mean sea level" in the metric system, or "feet above mean sea level" in United States customary and imperial units. Common abbreviations in English are: AMSL – above mean sea level [3] ASL – above sea level [4] FAMSL – feet above mean sea level [5] FASL – feet above sea level [6]
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 sea level (MSL). It is also used in aviation, where some heights are recorded and reported with respect to mean sea level (contrast with flight level ), and in the atmospheric sciences , and in land ...
AMSL is an acronym for "Above Mean Sea Level", the elevation of a location above a standardized sea level. AMSL may also refer to: Alberta Major Soccer League, a Canadian soccer league; Airbus Military Sociedad Limitada, a former aerospace company based in Spain; Aéroport Montréal Saint-Hubert Longueuil, a Canadian airport
This is as opposed to altitude/elevation above mean sea level (AMSL), or (in broadcast engineering) height above average terrain (HAAT). In other words, these expressions (AGL, AMSL, HAAT) indicate where the "zero level" or "reference altitude" is located.
QNH and QFE are arbitrary Q codes rather than abbreviations, but the mnemonics "nautical height" (for QNH) and "field elevation" (for QFE) are often used by pilots to distinguish between them. QNH and QFE will have errors when not at station elevation. QFF is aerodrome pressure (QNH) reduced to sea level. It is designed to read zero at sea ...
In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL [1] or HAGL) is a height measured with respect to the underlying ground surface.This is as opposed to height above mean sea level (AMSL or HAMSL), height above ellipsoid (HAE, as reported by a GPS receiver), or height above average terrain (AAT or HAAT, in broadcast engineering).
Since the Sea Level Datum of 1929 was a hybrid model, it was not a pure model of mean sea level, the geoid, or any other equipotential surface. Therefore, it was renamed the National Geodetic Vertical Datum of 1929 (NGVD 29) May 10, 1973, by the National Geodetic Survey , a part of the National Oceanic and Atmospheric Administration .
Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW). In non-tidal areas, e.g. the Baltic Sea , mean sea level (MSL) is used. [ 2 ] A chart datum is a type of vertical datum and must not be confused with the horizontal datum for the chart.