Chennai
Tides are measured from a datum called the Mean Sea Level
These days, elevations are measured from the Geoid model, which is a layer near sea level all of whose points have identical force of gravity. The old terminology that is still popular was "Mean Sea Level". ("Mean" is about the same as saying, "Average").
The level of its surface relative to the land. For mapping and other technical purposes the Mean Sea Level at a suitable reference location is used, to allow for the tides. I don't know the American equivalent, but for the UK the reference level is Mean Sea Level measured at Newlyn, Cornwall, as it is a convenient location little affected bycoastal features or the English Channel, Bristol Channel (the Severn Estuary), etc.
The two map coordinates or geodetic coordinates are latitude and longitude measured on the surface of the Earth's globe-shaped surface or at mean sea level or at the magnetic geoid.
Yes, mean sea level (MSL) is the average (mean) height of the sea.
A variable measured at the interval or ratio level can have more than one arithmetic mean.
mumbai
interval
Tides are measured from a datum called the Mean Sea Level
If you mean a 'spirit level' then when the line is in the center of the bubble then the object being measured is horizontal to the ground.
it is the highest part usable runway surface. Measured in feet above Mean Sea Level(MSL)
An altitude is measured from mean seal level on Earth. So asking what the planet's altitude is, is a nonsense question.
Its a starting point where elevations are measured from (The Sea) For instance the Mile High Stadium which is in Denver is 0ne mile above mean sea level or 5280 feet approximately.
Well, sea level is the standard by wich other things are measured, so zero is the answer. Sea level is sea level. Compared to what?
Mount Everest is the highest mountain on Earth, measured from mean sea level to its peak.
That you have been attacked by pirates.
Sea level is the level of the sea's surface. However this changes with the tides and with the weather conditions.Therefore Mean sea level (MSL), an average level of the surface of one or more of Earth's oceans is used as a datum from which heights such as elevations are measured.