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Absolute Altitude

Simply put, absolute altitude is the height of the aircraft above the actual landscape or terrain that it is flying. When an altimeter measures altitude, it measures the vertical elevation above a reference point. This point could be the surface of the earth, mean sea level, or some other point. Due to this reason, there are different types of altitudes, which include: indicated, pressure, density, true, calibrated, and absolute. This last type of altitude varies with not only the height of the plane, but also the height of the surface because it uses the ground or surface underneath the aircraft as its reference point. It is commonly referred to as high above ground level, or AGL.

It is important that the various “altitudes” in aviation are distinguished by modifiers, such as true, absolute, indicated, pressure, and density altitude. The purpose of differentiating the types of altitudes is for the safety of the parties communicating to each other about their vertical location in the sky. All parties exchanging information must understand which definition of altitude is being used to avoid confusion and mid-air collisions.

Absolute Altitude

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