1. Apparatus for locating any pixel within a satellite camera image in terms of latitude and longitude, said apparatus comprising: a satellite in orbit around a celestial body; an imaging camera on board the satellite for taking images of scenes on the celestial body, wherein each image is divided into a plurality of pixels; modeling means which uses measurements taken by the cameras to generate an estimate of the satellite's orbit and an estimate of the camera's attitude; and coupled to said modeling means, means for transforming pixel locations as announced by the camera into latitude and longitude coordinates with respect to the celestial body.