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What does above sea level mean?
Why is sea level called 'average'?
What is mean sea level?
Where is the marker indicating sea level located?
Height above mean sea level is a measure of a location's vertical distance ( height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level varies in different countries due to different reference points and historic measurement periods.
- Sea level - Wikipedia
The term APSL means above present sea level, comparing sea...
- Above mean sea level - Simple English Wikipedia, the free ...
The term above mean sea level ( AMSL) is the elevation or...
- Sea level - Simple English Wikipedia, the free encyclopedia
Sea level is generally used to refer to mean sea level...
- Sea level - Wikipedia
The current sea level is about 130 metres higher than the historical minimum. Historically low levels were reached during the Last Glacial Maximum (LGM), about 20,000 years ago. The last time the sea level was higher than today was during the Eemian, about 130,000 years ago.
Regions on the Earth's surface (or in its atmosphere) that are high above mean sea level are referred to as high altitude. High altitude is sometimes defined to begin at 2,400 meters (8,000 ft) above sea level.
In the above table, geopotential altitude is calculated from a mathematical model that adjusts the altitude to include the variation of gravity with height, while geometric altitude is the standard direct vertical distance above mean sea level (MSL).