The term is used in many fields and has a slight variation of meaning in all of them. Some of the variations are actually altitude which is the distance from sea level, absolute altitude which is the distance from the ground and pressure altitude which is the alleviation from the standard datum air pressure plane.
You will generally hear about altitude in the aerospace or aviation industry as it is regularly used.
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It is used in several fields of life including geology, geodesy and aviation. It is calculated in terms of the height from sea level in case of calculating a distance or the total vertical length of an object in other cases.
It is quite a common term which is generally used for the purpose of calculating height of a person or an object. We come across this measurement almost everyday as the height of a person is an important indicator which is constantly used.
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