What is sea level?

Sea Level

Mean sea level (MSL) is a measure of the average height of the ocean's surface (such as the halfway point between the mean high tide and the mean low tide); used as a standard in reckoning land elevation. MSL also plays an important role in aviation, where standard sea level pressure is used as the measurement datum of altitude at flight levels.

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Famous quotes containing the words sea and/or level:

    “The god Janus never had two more decidedly different faces than your sea captain.”
    —Herman Melville (1819–1891)

    “Let still the woman take
    An elder than herself. So wears she to him;
    So sways she level in her husband’s heart.”
    —William Shakespeare (1564–1616)