altitude

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altitude,

vertical distance of an object above some datum plane, such as mean sea levelsea level,
the level of the sea, which serves as the datum used for measurement of land elevations and ocean depths. Theoretically, one would expect sea level to be a fixed and permanent horizontal surface on the face of the earth, and as a starting approximation, this is true.
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 or a reference point on the earth's surface. It is usually measured by the reduction in atmospheric pressure with height, as shown on a barometerbarometer
, instrument for measuring atmospheric pressure. It was invented in 1643 by the Italian scientist Evangelista Torricelli, who used a column of water in a tube 34 ft (10.4 m) long.
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 or altimeteraltimeter
, device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear elevation as an airplane, balloon, or mountain climber rises.
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. In surveying and astronomy, it is the vertical angle of an observed point, such as a star or planet, above the horizon plane. The altitude of a feature of the earth's surface is usually called its elevationelevation,
vertical distance from a datum plane, usually mean sea level to a point above the earth. Often used synonymously with altitude, elevation is the height on the earth's surface and altitude, the height in space above the surface.
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. Recent spacecraft instrumentation has also measured vertical distances on the earth and other planets, determining the height of planetary features by means of radar and optical imaging.

In astronomy, altitude is the angular distance of a heavenly body above the astronomical horizon as determined by the angle which a line drawn from the eye of the observer to the heavenly body makes with the plane of the horizon. The reading of the apparent altitude, as determined by a telescope attached to a graduated circle, must be corrected for refraction by the atmosphere and for certain other effects to ascertain the true altitude. The altitude of the north celestial pole, which is approximately that of the star PolarisPolaris
or North Star,
star nearest the north celestial pole (see equatorial coordinate system). It is in the constellation Ursa Minor (see Ursa Major and Ursa Minor; Bayer designation Alpha Ursae Minoris) and marks the end of the handle of the Little Dipper.
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, is equal to the observer's latitude.

altitude

The angular distance of a point or celestial object above or below the horizon, or of an object, such as an artificial satellite, above mean sea level. Altitude and azimuth are coordinates in the horizontal coordinate system.

Altitude

(religion, spiritualism, and occult)

In astrology, altitude refers to the angular distance (i.e., measured in degrees of an arc) that a point, planet, or other heavenly body is situated above or below the horizon. Above the horizon, altitude is measured up to a maximum angular distance of 90° (directly overhead); below the horizon, down to a maximum of-90° (directly underneath).

Altitude

 

the angular displacement of an observed object, such as a flight vehicle or a celestial body, above the celestial horizon. In astronomy, altitude is used together with azimuth to determine the direction to an object in the horizon system of coordinates.

altitude

[′al·tə‚tüd]
Abbreviated alt.
(engineering)
Height, measured as distance along the extended earth's radius above a given datum, such as average sea level.
Angular displacement above the horizon measured by an altitude curve.
(mathematics)
The perpendicular distance from the base to the top (a vertex or parallel line) of a geometric figure such as a triangle or parallelogram.

altitude

altitudeclick for a larger image
altitude
Altitude (celestial).
.
i. The vertical distance of a level, a point, or an object considered as a point, measured from mean sea level (ICAO). In the case of aircraft in flight, it is normally expressed in flight levels or hundreds of feet. For example, an aircraft flying at 25,000 ft AMSL (above mean sea level) would be said to be flying at flight level 250. A barometric altimeter shows pressure altitude. When it is corrected for instrument errors and necessary compensation is made for variation from standard atmospheric conditions, it is called a true altitude. Absolute altitude is measured by a radio, radar, or laser altimeter. Absolute altitude is the true distance from the surface of the earth at that point. In some definitions, heights, which are the vertical distance of an object from an object, point, or level above ground or other reference plane, are also called altitude, such as in AGL (above ground level) altitude, MSL (mean seal level) altitude, and indicated altitude (that indicated by an altimeter).
ii. The angular displacement above the horizon; the arc of a vertical circle between the horizon and a point on the celestial sphere measured upward from the horizon from 0° to 90°. Angular displacement below the horizon is called negative altitude, or dip. See also computed altitude and density altitude.

altitude

1. Geometry the perpendicular distance from the vertex to the base of a geometrical figure or solid
2. Astronomy navigation the angular distance of a celestial body from the horizon measured along the vertical circle passing through the body
References in periodicals archive ?
Asi, en un gradiente altitudinal probablemente estos factores abioticos varian de tal forma que la productividad, y por ende la diversidad de especies de aves, deberia tener un pico hacia los limites inferiores del gradiente (Patterson et al.
Al respecto, se podria considerar que la variacion del gradiente natural de distribucion altitudinal de la especie se habria alterado al igual que en otras cuencas camaroneras probablemente debido a la mayor vulnerabilidad que presentan las hembras en la captura (no presentan una quela de mayor tamano como mecanismo de defensa, como en los machos) y a la mayor accesibilidad para la pesca en los sectores medio e inferior de la cuenca donde comunmente se distribuyen.
Para determinar la representatividad del esfuerzo de muestreo, se realizaron curvas de rarefaccion basadas en muestras para cada intervalo altitudinal y para el gradiente completo (Gotelli & Colwell, 2001), considerando la informacion completa del ciclo anual.
Distribucion altitudinal de musgos en el municipio de Popayan, Cauca.
Las altas tasas de recambio de especies a traves del gradiente altitudinal encontradas en este estudio se refleja en el alto porcentaje de especies halladas en una sola altitud 63% y en los bajos indices de similitud entre las altitudes, en un rango altitudinal estrecho entre los 1.
Ao comparar aspectos fitossociologicos de cinco fitotipias detectadas atraves do estudo do componente arboreo ao longo de um gradiente altitudinal da Serra da Prata--PR, Blum (2006) constata, de modo geral, o aumento das densidades em funcao do aumento da altitude, juntamente com a consequente reducao da profundidade do solo.
sh] rates for the sites with the larger soil C stocks could lead to a total net C loss at the three study sites, as was also observed for soils along altitudinal gradients in South America (Girardin et al.
The objective of this study was to determine whether plants of Lupinus elegans respond differently to drought, depending on the altitudinal origin of each provenance because this information is needed for adaptive management of restoration under climate change scenarios.
Sin embargo, en este estudio no se observo un patron en especifico con la altitud, aunque es posible reconocer un incremento de la riqueza a partir de los 550 hasta los 800 msnm, ya que en ese intervalo altitudinal fue donde se ubico el mayor numero de especies, en comparacion a la primera parte del gradiente (380 a 540 m); posteriormente, de los 900 a los 1100 msnm la riqueza disminuye notablemente.
2003), mientras que en el gradiente altitudinal han sido la disminucion de la productividad, el oxigeno y la temperatura (Jacobsen et al.
Es asi, como el presente estudio, aproxima la riqueza y estructura de las hepaticas que se encuentran en el PNMRT mediante la evaluacion de cinco sustratos (roca, materia en descomposicion, raiz aflorante, suelo desnudo y base de arbol) en un rango altitudinal de 2800 a 3300 m, que permitio evidenciar la diversidad de estas plantas y su comportamiento en los niveles altitudinales.