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14-September-2008 18:38:50 - Above mean sea level Redirected from AMSL April 2007 For the Michigan law school, see Ave Maria School of Law. The term above mean sea level AMSL refers to the elevation on the ground or altitude in the air of any object, relative to the average sea level datum. AMSL is used extensively in radio both in broadcasting and other telecommunications uses by engineers to determine the coverage area a station will be able to reach. It is also used in aviation, all heights are recorded and reported with respect to AMSL though also see flight level, and in the atmospheric sciences. Contents 1 Definition 2 Usage 3 See also 4 References Definition The concept of a mean sea level is in itself rather artificial, because it is not possible to determine a figure for mean sea level for the entire planet, and it varies quite a lot even on a much smaller scale. This is because the sea is in constant motion, affected by the high and low pressure zones above it, the tides, local gravitational differences, and so forth. The best one can do is to pick a spot and calculate the mean sea level at that point and use it as a datum. For example, the Ordnance Survey uses a height datum based on the measurements of mean sea level at a particular gauge at Newlyn, Cornwall from 1915 to 1921 1 for their maps of Great Britain, and this datum is actually some 80 cm different from the mean sea level reading obtained on the other side of the country. An alternative is to base height measurements on an ellipsoid of the entire earth, which is what systems such as GPS do. In aviation, the ellipsoid known as World Geodetic System 84 is increasingly used to define mean sea level. Another alternative is to use a geoid based datum such as NAVD88. Usage When referring to geographic features such as mountains on a topographic map, variations in elevation are shown by contour lines. The elevation of a mountain denotes the highest point or summit and is typically illustrated as a small circle on a topo map with the AMSL height shown in either meters or feet or both. The height above average terrain HAAT for a station is determined from topographic maps by averaging the elevation AMSL at points along several radials or radii. This is subtracted from the elevation AMSL of the antenna, including both the tower itself and the ground it is on, to determine the difference. Negative numbers for HAAT sometimes result from this when the station or airport is in a valley, which is significantly lower AMSL than the surrounding mountains. In the rare case that a location is below sea level, AMSL itself is a negative number. For one such case see Schiphol Airport. AMSL is also important to engineers in high-elevation areas because some equipment is not designed with enough airflow for sufficient cooling in the thin air, which can cause overheating, damage, and failure of the electronic components within a transmitter. See also Above ground level For sample AMSL elevations, see, 1 E3 m list of mountains Ranges, peaks and passes of the Alps Orthometric height Normal height Geopotential height Extreme points of the world References National Tidal Sea Level facility Retrieved from http://en..org/wiki/Above_mean_sea_level Categories: Physical geography | Antennas radio | Aviation terminology | TopographyHidden categories: Articles lacking sources from April 2007 | All articles lacking sources Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages БългарÑ?ки ÄŒesky Deutsch Esperanto Hrvatski Italiano Magyar МакедонÑ?ки ‪Norsk bokmÃ¥l‬ ‪Norsk nynorsk‬ Polski РуÑ?Ñ?кий SlovenÄ?ina SlovenÅ¡Ä?ina Svenska УкраїнÑ?ька Vèneto This page was last modified on 28 August 2008, at 08:16
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