ECEF Co-ordinate Frame

The ECEF (Earth-centred earth-fixed) co-ordinate frame is a Cartesian co-ordinate frame used to represent absolute positions on the Earth. Its origin is at the centre of the Earth. ECEF is an alternative to the geodetic co-ordinate frame. It is represented by the three axes X, Y and Z which are presented graphically in Graphic Showing Geodetic, NED and ECEF Co-ordinates. ECEF positions can be retrieved from Advanced Navigation products, however the geodetic system is used as the default.