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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 ...
- List of countries by average elevation
This is a list of countries and territories by their average...
- Above mean sea level
The term above mean sea level (AMSL) is the elevation or...
- Ordnance datum
An ordnance datum ( OD) is a vertical datum used by an...
- List of countries by average elevation
The term above sea level generally refers to 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.
Orthometric height is one of the scientific formalizations of a laypersons' "height above sea level", along with other types of heights in Geodesy. In the US, the current NAVD88 datum is tied to a defined elevation at one point rather than to any location's exact mean sea level.
Il livello del mare relativo (relative sea level, RSL) è una misura del livello del mare effettuata rispetto al fondale oceanico oppure, per le misurazioni locali, rispetto ad un punto di riferimento sulla terra ferma.
