Ellipsoidal height is a measurement that indicates the vertical distance of a point above or below a reference surface known as an ellipsoid. An ellipsoid is a mathematically defined, smooth shape that approximates the Earth's shape, which is slightly flattened at the poles and bulging at the equator. This height is commonly used in geodesy and navigation to provide a consistent way to represent elevations. In practical terms, ellipsoidal height is often used in conjunction with other height measurements, such as orthometric height, which is based on mean sea level. By understanding ellipsoidal height, scientists and engineers can accurately position objects and analyze geographical data in relation to the Earth's surface.