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.
Read more about Sea Level: Measurement, Difficulties in Utilization, Sea Level and Dry Land, Recent Changes, Aviation
Famous quotes containing the words sea and/or level:
“The human heart is like a ship on a stormy sea driven about by winds blowing from all four corners of heaven.”
—Martin Luther (1483–1546)
“Jealousy is indeed a poor medium to secure love, but it is a secure medium to destroy one’s self-respect. For jealous people, like dope-fiends, stoop to the lowest level and in the end inspire only disgust and loathing.”
—Emma Goldman (1869–1940)