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Altitude: Difference between revisions
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==Pressure altitude== | ==Pressure altitude== | ||
*Altitude in terms of the air pressure. | *Altitude in terms of the air pressure. | ||
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To assure vertical separation [[IFR]] pilots are required to use the altimeter. It is not allowed to use the height measured by GPS systems. | To assure vertical separation [[IFR]] pilots are required to use the altimeter. It is not allowed to use the height measured by GPS systems. | ||
==Density altitude== | ==Density altitude== | ||
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==Elevation== | ==General Definitions== | ||
===Height=== | |||
*Altitude in terms of the distance above a certain point. | |||
===Absolute altitude=== | |||
*Altitude in terms of the distance above the ground ([[AGL]]) directly below it. | |||
Ground radar and ground warning systems display absolute altitude. The [[altimeter]] can be set to display zero while being on the airfield, the [[#Indicated altitude]] will be the absolute altitude while being near the airfield. | |||
In FlightGear there is a "system" altitude, that altitude is [[AMSL]]. Some will refer to this altitude as Absolute altitude. | |||
===True altitude=== | |||
*Altitude in terms of elevation above sea level ([[AMSL]]). | |||
After setting the [[altimeter]] on [[#QNH]] the [[#Indicated altitude]] is the true altitude. | |||
===Elevation=== | |||
The [[#True altitude]] of positions on the ground is referred to as the elevation. In aviation these positions normally are runways or mountain peaks. | The [[#True altitude]] of positions on the ground is referred to as the elevation. In aviation these positions normally are runways or mountain peaks. | ||