Also height above sea level; see under sea level.
The height above sea level (hence also sea level) refers to various geodetic altitudes. A mean sea level is specified as the zero level, which may be determined from local measurements or set by definition. After specifying a zero level, altitude data are in principle independent of the actual sea level. Depending on the country, different height definitions are usually used. For reference heights of national surveys, the defined mean value of a...
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Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)