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单词 Mean level of the sea
释义

Mean level of the sea

英语百科

Sea level

This marker indicating sea level is situated between Jerusalem and the Dead Sea.
Sea level measurements from 23 long tide gauge records in geologically stable environments show a rise of around 200 millimetres (7.9 in) during the 20th century (2 mm/year).




1. Ocean2. Reference ellipsoid3. Local plumb line

4. Continent5. Geoid
Sea Level sign seen on cliff (circled in red) at Badwater Basin, Death Valley National Park

Sea level is generally used to refer to mean sea level (MSL), an average level for the surface of one or more of Earth's oceans from which heights such as elevations may be measured. MSL is a type of vertical datum a standardised geodetic reference point that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured in order to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is the midpoint between a mean low and mean high tide at a particular location.

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