Height above ground level

In aviation, atmospheric sciences and broadcasting, 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 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
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