Quantities which define the position of a point on the spheroid of reference (for example, the Earth) with respect to the planes of the geodetic equator and of a reference meridian. Commonly expressed in terms of latitude and longitude.
the latitude and longitude of a point on the Earth's surface determined from the geodetic vertical (normal to the specified spheroid). (See zenith; latitude, terrestrial; longitude, terrestrial.)
Latitude, longitude and altitude; for specifying positions. All are defined relative to the geode ("mean sea level"). Altitude and latitude have first-order dependence on the departure of the geode from a spherical shape; longitude has a second order dependence that is neglected in the ISO calculations. See definitions of each coordinate for details.