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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 ...
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."
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 .
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. [8] [9] [10] At high altitude, atmospheric pressure is lower than that at sea level. This is due to two competing physical effects ...
A way to visualize prominence is to imagine raising sea level so the parent peak and subject peak are two separate islands. Then lower it until a tiny land bridge forms between the two islands. This land bridge is the key col of the subject peak, and the peak's prominence is its elevation from that key col.
This is a list of the highest astronomical observatories in the world, considering only ground-based observatories and ordered by elevation above mean sea level. The main list includes only permanent observatories with facilities constructed at a fixed location, followed by a supplementary list for temporary observatories such as transportable ...
The Low Elevation Coastal Zone (LECZ) refers to low-lying coastal areas with an elevation below a certain threshold, commonly 10 meters, above mean sea level.Globally, there is a substantial and growing population living in the Low Elevation Coastal Zone, which consists of approximately 2% of the world's land area and around 11% of the global population.