What does AGL stand for in aviation terminology?

In aviation terminology, AGL stands for "Above Ground Level." This term is crucial as it provides a reference for altitude measurements that are specifically related to the height of an aircraft or unmanned aircraft system (UAS) above the terrain directly below it.

Measuring altitude using AGL allows pilots and operators to assess their aircraft's distance from obstacles and terrain features, which is critical for ensuring safety during flight operations. For instance, knowing the AGL helps prevent collisions with trees, buildings, and other structures, especially in low-altitude flight scenarios such as those often encountered with drones.

Other terms that might be confusing include several variations on the term "ground level," but they do not accurately represent the standard definition used in aviation. "Air Ground Level," "Aeronautical Ground Level," and "Altitude Ground Level" do not align with established terminology and would likely create ambiguity in communication among pilots and air traffic personnel. Therefore, understanding that AGL means "Above Ground Level" is essential for effective aerial navigation and safety management.