Altitude
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Altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to the context
An airliner flying in the stratosphere where airliners typically cruise to reduce fuel consumption. The blue layer is the ozone layer, fading further to the mesosphere.
Altimeter
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An altimeter, or altitude meter, is an instrument used to measure the altitude of an object relative to a fixed level. The measurement of altitude is called altimetry, which is related to the term bat
Altitude
…so it is necessary to specify which is being used unless it is obvious from the context. In aviation altitude is usually measured using a barometric altimeter set to use either the local sea level pressure or the standard sea level pressure as the basis for zero altitude. GPS and radio altimeters are also…
Digital barometric pressure sensor for altitude measurement in consumer electronic applications
The altimeter on this Piper PA-28 is seen on the top row of instruments, second from right.