In order to determine the altimeter setting, the standard atmosphere pressure (P 0) of 101325 Pa at sea level usually used for the icao standard atmosphere calculation, is replaced in this case by the station pressure reduced to the equivalent pressure at sea level. In order to improve accuracy when closer to the ground, altimeters are adjustable to the local atmospheric pressure, or the equivalent pressure at sea level. The atmospheric model assumes the air is a dry ideal gas, with an atmospheric pressure of 101325 Pa and a temperature of 288.15 K at mean sea level. The method and formulas used are based on the ICAO Standard Atmosphere 1993 model and is implemented here over the range of 5000 metres below mean sea level up to a height of 11,000 metres above mean sea level.Ī station is the location where the atmospheric pressure is measured, but it comes from the term ‘Weather Station’, which is where meteorological measurement instrumentation is housed to monitor and report current conditions for aviation purposes. This tool which is based on the icao standard atmosphere model will calculate the station elevation relative to mean sea level, station pressure or the sea level pressure used for QFE or QNH setting altimeters. US Standard Atmosphere Altitude and Pressure Calculator.
ICAO Standard Atmosphere Altitude and Pressure Calculator.
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