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Meanings of above mean sea level in English

Used to indicate the elevation on the ground or altitude in the air of an object, relative to the average sea level datum.

        Usage of above mean sea level in English
        1
        The winds were nearly calm at the surface; at 10,300 feet above mean sea level, they were from the southwest at 10 knots.
        Project Trinity, 1945-1946
        2
        The interface between the two is about 40m below mean sea level, for every 1m that the water table lies above mean sea level.
        The South African