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:
“They call them the haunted shores, these stretches of Devonshire and Cornwall and Ireland which rear up against the westward ocean. Mists gather here, and sea fog, and eerie stories. That’s not because there are more ghosts here than in other places, mind you. It’s just that people who live hereabouts are strangely aware of them.”
—Dodie Smith, and Lewis Allen. Roderick Fitzgerald (Ray Milland)
“It may be well to remember that the highest level of moral aspiration recorded in history was reached by a few ancient Jews—Micah, Isaiah, and the rest—who took no count whatever of what might not happen to them after death. It is not obvious to me why the same point should not by and by be reached by the Gentiles.”
—Thomas Henry Huxley (1825–95)