How is field elevation determined at an airport?

Field elevation at an airport is primarily defined as the height above mean sea level (MSL) of the highest point of any runway. This measurement is crucial because it provides a standard reference for altitude settings in aviation operations, ensuring that aircraft can safely take off and land, and that pilots have accurate information regarding their altitude in relation to the airport.

Determining field elevation in this manner allows for consistency and safety across various flight operations and navigation aids, as it standardizes the altitudes pilots use when approaching and departing from the airport. Additionally, the highest point of any runway takes into account the potential for variations in elevation that can occur across different parts of the airport, which might not be addressed by simply using ground level at specific locations like terminals or other structures.

This approach ensures that all relevant factors that could affect the safe operation of an aircraft are considered, establishing a clear protocol that pilots and air traffic control can follow to maintain safety standards.