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Above mean sea level The term above mean sea level (AMSL) refers to the elevation (on the ground) or altitude (in the air) of any object, relative to the average sea level datum.AMSL is used extensively in radio (both in broadcasting and other telecommunications uses) by engineer s to determine the coverage area a station will be able to reach. ...
ความสูงเหนือระดับน้ำทะเล ( อังกฤษ: metres above sea level, MASL) หรือ ความสูงเหนือระดับน้ำทะเลปานกลาง ( อังกฤษ: metres above mean sea level, MAMSL) เป็นมาตรฐาน การวัด ...
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Islands average only one to two square kilometers in area, and lie between 1–1.5 m (3 ft 3 in – 4 ft 11 in) above mean sea level. Although some of the larger atolls are approximately 50 km (31 mi) long from north to south, and 30 km (19 mi) wide from east to west, no individual island is longer than eight kilometers.
Normalhöhennull ("standard elevation zero") or NHN is a vertical datum used in Germany. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence height above mean sea level used in the 1932 German Mean Height Reference System ( Deutsches Haupthöhennetz ). [1] The plane is in the shape of a quasi- geoid.
The free-air correction adjusts measurements of gravity to what would have been measured at mean sea level, that is, on the geoid. The gravitational attraction of earth below the measurement point and above mean sea level is ignored and it is imagined that the observed gravity is measured in air, hence the name.
This means they have had a disproportionate contribution to historical sea level rise and are set to contribute a smaller, but still significant fraction of sea level rise in the 21st century. Observational and modelling studies of mass loss from glaciers and ice caps show they contribute 0.2-0.4 mm per year to sea level rise, averaged over the 20th century. [149]
