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Altimetry is the measurement of altitude or elevation above sea level. Common techniques are: [8] [9] Surveying, especially levelling. Global Navigation Satellite System (such as GPS), where a receiver determines a location from pseudoranges to multiple satellites. A geoid is needed to convert the 3D position to sea-level elevation.
This is an accepted version of this page This is the latest accepted revision, reviewed on 12 February 2025. This is a list of countries and territories by their average elevation above sea level based on the data published by Central Intelligence Agency, unless another source is cited. The list includes sovereign states and self-governing dependent territories based upon the ISO standard ISO ...
The highest village on Tutuila island (and American Samoa) is the village of A'oloau [3] — A'oloau is at an elevation of 1,340 feet (410 meters), [2] and had a population of 615 as of 2010. [4] The highest peak in American Samoa is Lata Mountain at an elevation of 3,163 feet (964 meters). [ 5 ]
This list of the highest cities in the world includes only cities with a population greater than 100,000 inhabitants and an average height above sea level over 2,000 metres (6,600 ft). This list is incomplete ; you can help by adding missing items .
Aviation altitude is measured using either mean sea level (MSL) or local ground level (above ground level, or AGL) as the reference datum. Pressure altitude divided by 100 feet (30 m) is the flight level, and is used above the transition altitude (18,000 feet (5,500 m) in the US, but may be as low as 3,000 feet (910 m) in other jurisdictions ...
For example, if a station reports that the 500 mb [i.e. millibar] height at its location is 5600 m, it means that the level of the atmosphere over that station at which the atmospheric pressure is 500 mb is 5600 meters above sea level. This is an estimated height based on temperature and pressure data."
The key col for Aconcagua, if sea level is disregarded, is the Bering Strait at a distance of 13,655 km (8,485 miles). The key col for the South Summit of Mount Everest is about 100 m (330 feet) distant. A way to visualize prominence is to imagine raising sea level so the parent peak and subject peak are two separate islands.
The orthometric height (symbol H) is the vertical distance along the plumb line from a point of interest to a reference surface known as the geoid, the vertical datum that approximates mean sea level. [1] [2] Orthometric height is one of the scientific formalizations of a layman's "height above sea level", along with other types of heights in ...