What does the term 'height' refer to in aviation?

In aviation, the term 'height' specifically refers to the vertical distance of an aircraft above a specific reference point or datum, which is often defined as the mean sea level (MSL). This context is crucial as it distinguishes 'height' from other related terms such as 'altitude' and 'elevation.'

When discussing height above a specific datum, pilots and air traffic controllers communicate using references that ensure safety and clarity. This can include the aircraft’s height in relation to a particular airport elevation, sea level, or any other relevant reference point. The idea is that “height” pertains to measurements that can vary depending on the datum used, which can be critical in operations such as approach and landing.

Other terms, such as altitude, typically refer to distance above sea level, which is often confused with height. However, while altitude generally denotes this vertical distance relative to sea level, height emphasizes the relationship with the specific reference point chosen. In this context, 'height' being defined relative to a specific datum (often charted or known elevations) is the most accurate understanding within aviation practices.