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The photogrammetric bundle adjustment of line scanner image data requires a precise description of the time-dependent image orientation.For this task exterior orientation parameters of discrete points are used to model position and viewing direction of a cameratrajectory via polynomials. This paper investigates the influence of the distance between these orientation points on the quality oftrajectory modeling. A new method adapts the distance along the trajectory to the available image information. Compared to a constantdistance as used previously, a better reconstruction of the exterior orientation is possible, especially when image quality changes withina strip.  In our research we use image strips of the High Resolution Stereo Camera (HRSC), taken to map the Martian surface. Several experimentson the global image data set have been carried out to investigate how the bundle adjustment improves the image orientation, ifthe new method is employed. For evaluation the forward intersection errors of 3D points derived from HRSC images, as well as theirremaining height differences to the MOLA DTM are used.  In 13.5 % (515 of 3,828) of the image strips, taken during this ongoing mission over the last 12 years, high frequency image distortionswere found. Bundle adjustment with a constant orientation point distance was able to reconstruct the orbit in 239 (46.4 %) cases. Avariable orientation point distance increased this number to 507 (98.6 %)

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

GLOBAL BUNDLE ADJUSTMENT WITH VARIABLE ORIENTATION POINT DISTANCE FOR PRECISE MARS EXPRESS ORBIT RECONSTRUCTION