Orthometric height is a measurement that indicates the height of a point above the mean sea level. It is determined by measuring the distance from the point to the geoid, which is an equipotential surface representing the average sea level across the globe. This height is crucial for various applications, including mapping, construction, and navigation. The concept of orthometric height is essential in geodesy, the science of measuring the Earth's shape and gravitational field. It helps in understanding how elevation affects gravity and is used in creating accurate topographic maps and models of the Earth's surface.