Photogrammetric Point Determination Using Digital Galileo Ssi Images from Asteroid Ida (original) (raw)
The paper deals with the photogrammetric point determination using digital images of the asteroid 243 Ida, which were acquired during the second asteroid flyby of the Galileo spacecraft in August 1993. The photogrammetric point determination was carried out with three different methods: Forward intersections assuming error-free orientation parameters, bundle adjustment without orbital constraints, and bundle adjustment including orbital constraints. The forward intersections lead to poor results, since, in fact, the orientation parameters of the images are not error-free. Thus the functional model has significant systematic errors. Much better results could be achieved by the conventional bundle adjustment, where the exterior orientation parameters were treated as unknowns in the collinearity equations and, in addition, introduced as direct observations. The best results were obtained from the bundle adjustment with orbital constraints. This approach guarantees that all exposure sta...