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.
Famous quotes containing the words sea and/or level:
“Rain patters on a sea that tilts and sighs.
Fast-running floors, collapsing into hollows,
Tower suddenly, spray-haired.”
—Philip Larkin (19221986)
“Those who profess contempt for men, and put them on a level with beasts, yet wish to be admired and believed by men, and contradict themselves by their own feelingstheir nature, which is stronger than all, convincing them of the greatness of man more forcibly than reason convinces them of his baseness.”
—Blaise Pascal (16231662)