Orientation of Moms-02/d2 and Moms-2p Imagery

This paper deals with the orientation of 3-line imagery which has been taken during the MOMS-02/D2 experiment in spring 1993, and which will be acquired in course of the MOMS-02/PRIRODA project, scheduled for launch in April 1996. The reconstruction of the image orientation is based on a combined adjustment of the complete image, ground control, orbit and attitude information. To this end, the conventional bundle adjustment algorithm is supplemented by a rigorous dynamical modeling of the spacecraft motion to take orbital constraints into account. The results of the combined adjustment using MOMS-02/D2 imagery and control information of orbit #75B are presented. About 14 000 conjugate points in one imaging sequence covering 43037 km 2 were processed together with the epoch state vector, attitude data and 12 GPS-derived ground control points (GCP). Within the threefold overlapping area an empirical accuracy of 12 m (0.9 pixel) in planimetry and 7 m (0.5 pixel) in height was achieved as veriied by 63 independent check points. Computer simulations on MOMS-2P image orientation and point determination based on realistic input information have shown that the accuracies of the estimated exterior orientation parameters and object point coordinates will be in-suucient, if single strips are processed without any ground control, due to the poor absolute attitude information. Good accuracies, in constrast, can be obtained either with a few precise GCP or even without ground control information, if a block of several overlapping strips with high geometric strength (q 60%) is adjusted.