Altitude measurement refers to the process of determining the height of an object or point in relation to sea level or ground level. This can be done using various methods, including barometric pressure measurements, GPS technology, and laser altimetry. Each method has its own advantages and is used in different applications, such as aviation, hiking, and surveying. In aviation, pilots rely on altitude measurement to ensure safe flight operations. Instruments like altimeters, which measure air pressure, help pilots maintain the correct altitude during takeoff, cruising, and landing. Accurate altitude measurement is crucial for avoiding obstacles and ensuring safe distances between aircraft, especially in crowded airspaces.