absolute altitude的意思|示意

Absolute altitude is a term used to describe the height of an object above sea level, such as a mountain peak. It is also referred to as 'true altitude' or 'geometric altitude'.

The term absolute altitude is often used in contrast with relative altitude, which describes the height of an object relative to its surroundings, such as the height of a cloud above the ground. Relative altitude is generally expressed in feet or meters, while absolute altitude is generally expressed in feet or meters above sea level.

Absolute altitude can be calculated in a number of ways, including using a barometric altimeter, GPS or radar. Barometric altimeters measure the atmospheric pressure at a given location; the higher the pressure, the lower the altitude. GPS measures altitude by taking into account the deflection of the Earth's magnetic field at a given location. Radar is used to measure the absolute altitude of an object by projecting a beam of radiation at the object and measuring the time it takes for the beam toreflect off the object and return to the source.

Absolute altitude is used in a variety of applications, from aviation to mountaineering. In aviation, absolute altitude is used to measure and maintain aircraft altitude, as well as to determine air speeds and air density. In mountaineering, absolute altitude can be used to measure the height of a mountain and to compute ascent and descent rates. In meteorology, absolute altitude is used to measure the temperature and humidity of the atmosphere at different altitudes.

In addition to its practical applications, absolute altitude can also be used to gain a better understanding of our environment. It helps to illustrate how the Earth's atmosphere and topography are structured. By measuring absolute altitude, scientists can better understand how global climate and weather patterns form and evolve.