Video encyclopedia

Sea level


What is Sea Level?


What Is Sea Level, Anyway?


What Causes Sea Level Rise?


SEA LEVEL 2: MAGIC ARCH - Official Trailer (2020)


SEA LEVEL 2 Trailer (Animation, 2020)

Mean sea level (MSL) is an average level of the surface of one or more of Earth's oceans from which heights such as elevation may be measured. MSL is a type of vertical datum – a standardised geodetic reference system – 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 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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    • Measurement 

    • Dry land 

    • Change 

    • Aviation