ECEF (earth-centred, earth-fixed) Cartesian co-ordinates are used to define a point in three-dimensional space. ECEF co-ordinates are defined relative to an x-axis (the intersection of the equatorial plane and the plane defined by the prime meridian), a y-axis (at 90° to the x-axis and its intersection with the equator) and a z-axis (intersecting the North Pole). All the axes intersect at the point defined by the centre of mass of the Earth.

public sealed class ECEFRef : CoordinateSystem

Public NotInheritable Class ECEFRef
	Inherits CoordinateSystem

public ref class ECEFRef sealed : public CoordinateSystem

[<SealedAttribute>]
type ECEFRef =  
    class
        inherit CoordinateSystem
    end