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Height above ground level information


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). In other words, these expressions (AGL, AMSL, HAE, AAT) indicate where the "zero level" or "reference altitude" – the vertical datum – is located.

Abbreviation Stands for Main usage Zero level Measuring devices
AGL, HAGL height above ground level aviation, atmospheric science, broadcasting ground surface radar altimeter
AMSL, HAMSL height above mean sea level nautic, technics, geography sea level average barometric altimeter
HAE height above ellipsoid navigation, science math surface model WGS84 GPS receiver
AAT, HAAT height above average terrain broadcasting, cellular networks average surrounding surface
  1. ^ Radiotelephony Manual. UK Civil Aviation Authority. 28 May 2015. ISBN 9780-11792-893-0. CAP413.

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Height above ground level

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a height above ground level (AGL or HAGL) is a height measured with respect to the underlying ground surface. This is as opposed to height above mean...

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Height above mean sea level

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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...

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Elevation

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location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential...

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Height

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mountain peak), then altitude (height above sea level) is called elevation. In a two-dimensional Cartesian space, height is measured along the vertical...

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Vertical position

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in geodesy Height above mean sea level Height above average terrain Height above ground level Measured depth Normal height Orthometric height Thickness...

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Wind gradient

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increase in height above ground level. In metric units, it is often measured in units of meters per second of speed, per kilometer of height (m/s/km), which...

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Vertical datum

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cited in height above sea level, although what "sea level" actually means is a more complex issue than might at first be thought: the height of the sea...

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Altimeter

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are industry standard. The radar altimeter is used to measure height above ground level during landing in commercial and military aircraft. Radar altimeters...

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Sea level

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Mission on the Jason-2 satellite in 2008. Height above mean sea level (AMSL) is the elevation (on the ground) or altitude (in the air) of an object, relative...

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Tomb of Darius the Great

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of Persepolis in Iran. They are all situated at a considerable height above ground-level. One of the tombs is explicitly identified by an accompanying...

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Storey

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ground or street level is called the "ground floor" (i.e. it needs no number; the floor below it is called "basement", and the floor above it is called "first")...

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Airs above the ground

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airs above the ground or school jumps are a series of higher-level, Haute ecole, classical dressage movements in which the horse leaves the ground. They...

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Height above average terrain

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Height above average terrain (HAAT), or (less popularly) effective height above average terrain (EHAAT), is the vertical position of an antenna site above...

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Mathur Aqueduct

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supported by 28 huge pillars, the maximum height of the pillars reaching 115 ft. The trough structure is 7 ft in height, with a width of 7.5 ft. The trough...

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Radar altimeter

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altimeter. A radar altimeter measures absolute altitude: the height "Above Ground Level" (AGL). As of 2010[update], all commercial radar altimeters use...

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List of abbreviations in oil and gas exploration and production

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bushing elevation (in meters above sea level, or meters above ground level) KBG – kelly bushing height above ground level KBUG – kelly bushing underground...

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Flight level

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the aircraft's actual height above ground. At low altitudes, the altimeter is commonly set to show the altitude above sea level, which can be directly...

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Asisguard Songar

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It can operate in a height above ground level of 400 m (1,300 ft) at a maximum elevation of 2,800 m (9,200 ft) above mean sea level. The drone is dust-resistant...

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United Air Lines Flight 553

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altitude of 1,040 feet (320 m) MSL corresponded to an actual height above ground level (AGL) of only 429 feet (131 m).: 7  When Flight 553 reached the...

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Tree height measurement

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point would not add to the height of the tree. On a slope this base point is considered as halfway between the ground level at the upper and lower sides...

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Nakagin Capsule Tower

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Biru Maximum height above ground level was 53.5 and 47.4 m (176 and 156 ft) for the 13- and 11-storey towers, respectively.: 107  Height, width, and length...

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Atmospheric dispersion modeling

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above) requires the input of H which is the pollutant plume's centerline height above ground level—and H is the sum of Hs (the actual physical height...

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Diameter at breast height

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many countries, DBH is measured at approximately 1.3 m (4.3 ft) above ground. The height can make a substantial difference to the measured diameter. In...

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Atmospheric pressure

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contrast to mean sea-level pressure, which involves the extrapolation of pressure to sea level for locations above or below sea level. The average pressure...

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Levelling

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height differences of construction artifacts. Optical levelling, also known as spirit levelling and differential levelling, employs an optical level,...

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Floor plan

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an orthogonally projected plane cut at the typical four foot height above the floor level. A floor plan could show: interior walls and hallways restroom...

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