This subclass is used for describing a point that provides the position of the lens or sensor used for airborne imaging. The additional attributes provide the geometry of the image plane of the camera. omega, phi and kappa refer to lateral tilt (rotation about x-axis), longitudinal tilt (rotation about the y-axis), and swing (rotation about the z-axis), respectively. These definitions are all with reference to the photogrammetric, right handed coordinate system, XYZ, in the model space with the positive direction of the x-axis close to the direction of the flight line and that of the z-axis upward, as defined by the International Society for Photogrammetry, London, 1960. (Albertz and Kreiling, 1975)