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ASL – above sea level [4] FAMSL – feet above mean sea level [5] FASL – feet above sea level [6] MAMSL – metres above mean sea level [5] MASL – metres above sea level [5] [6] MSL – mean sea level [7] For elevations or altitudes, often just the abbreviation MSL is used, e.g., Mount Everest (8849 m MSL), or the reference to sea level ...
It superseded the National Geodetic Vertical Datum of 1929 (NGVD 29), [2] previously known as the Sea Level Datum of 1929. NAVD 88, along with North American Datum of 1983 (NAD 83), is set to be replaced in 2025 with a new geometric reference frame and geopotential datum, based on GPS and gravimetric geoid models.
For example, gravity is 0.1% stronger in the northern United States than in the southern, so a level surface that has an orthometric height of 1000 meters in one place will be 1001 meters high in other places. In fact, dynamic height is the most appropriate height measure when working with the level of water over a large geographic area. [4]
However, most of the village's population lives near sea level. The village of Umatac is also at a high elevation. 3750 feet (1143 m) Volcano Hawaii: 6290 feet (1917 m) Island Park Idaho [17] 994 feet (303 m) Stockton Illinois: 1211 feet (369 m) Bethel Indiana [18] 1598 feet (487 m) Allendorf Iowa [18]
Since the Sea Level Datum of 1929 was a hybrid model, it was not a pure model of mean sea level, the geoid, or any other equipotential surface. Therefore, it was renamed the National Geodetic Vertical Datum of 1929 (NGVD 29) May 10, 1973, by the National Geodetic Survey , a part of the National Oceanic and Atmospheric Administration .
The term above sea level generally refers to the height above mean sea level (AMSL). The term APSL means above present sea level, comparing sea levels in the past with the level today. Earth's radius at sea level is 6,378.137 km (3,963.191 mi) at the equator.
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Download QR code; Print/export Download as PDF; ... Enlargeable map of the 50 U.S. states by mean elevation. ... sea level: 41 500 ft