Integrating Orbital Constraints into MOMS-02 Image Orientation

Abstract

The Modular Optoelectronic Multispectral Stereo Scanner MOMS-02 acquired digital mulitspectral and threefold stereo imagery of the earth surface during the 2nd German Spacelab mission D2 on April/May 1993. In order to properly utilize the image information contained in the conjugate point coordinates and the orbit information contained in the TDRSS tracking data, both data types have to be evaluated in a combined adjustment process. To this end, the conventional bundle block adjustment algorithm is supplemented by a rigorous dynamical modeling of the space shuttle motion to take orbital constraints into account. First results of combined approach applied to MOMS-02 imagery and TDRSS tracking data are presented. 34 000 conjugate points in three overlapping image strips covering 430x78 qkm in North-West Australia (orbit Nr.75B) were determined by digital image matching and processed together with the epoch state vector, IMU data and GPS-derived control points.Within the threefold overlapping area an empirical accuracy of 12m (0.9 pixel) in X, Y and Z was achieved as verified by 42 independent check points.