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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).
Thus, one may see only external borders within the chart, with the 1,200-foot (370 m) region extending off the chart. When class E airspace begins at altitudes other than 1,200 feet (370 m) AGL, 700 feet (210 m) AGL, or 14,500 feet (4,400 m) MSL, a delimiting border resembling links in a chain in dark cyan separates the areas, and specific ...
MEF's of 4700 and 3300 feet are shown on this excerpt from the FAA's Los Angeles sectional aeronautical chart. Maximum elevation figure ( MEF ) is a type of visual flight rule (VFR) information that indicates the elevation of the highest geographical feature within a GEOREF quadrangle area.
Class A airspace is generally the airspace from 18,000 feet (~3.4 miles, 5.5 km) mean sea level (MSL) up to and including flight level (FL) 600 (~11.4 miles, 18.3 km), including the airspace overlying the waters within 12 nautical miles (NM) (~13.8 miles, 22.2 km) of the coast of the 48 contiguous states and Alaska. Unless otherwise authorized ...
Class C is a class of airspace in the United States which follows International Civil Aviation Organization (ICAO) air space designation. Class C airspace areas are designed to improve aviation safety by reducing the risk of mid-air collisions in the terminal area and enhance the management of air traffic operations therein. [1]
Above Ground Level (AGL) A measurement of elevation, or "height", above a specific land mass (also see MSL). International Civil Aviation Organization The ICAO is the specialized agency of the United Nations with a mandate "to ensure the safe, efficient and orderly evolution of international civil aviation."
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Control areas are established in any areas when the density of air traffic is high: [2] An airway is a case of a "control area or portion of thereof established in the form of a corridor". [3] Terminal Control Area is "a control area normally established at the confluence of ATS routes in the vicinity of one or more major aerodromes." [1] [3]