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 trumpets sound, the banners fly,
The glittering spears are ranked ready;
The shouts o’ war are heard afar,
The battle closes thick and bloody;
But it’s no the roar o’ sea or shore
Wad mak me langer wish to tarry;
Nor shout o’ war that’s heard afar,
Its leaving thee, my bonnie Mary.”
—Robert Burns (1759–1796)
“There are old heads in the world who cannot help me by their example or advice to live worthily and satisfactorily to myself; but I believe that it is in my power to elevate myself this very hour above the common level of my life.”
—Henry David Thoreau (1817–1862)