It may be tentatively concluded, on the basis of the preliminary 
results of this investigation, that the restoration of GPS trajectories 
by OTF ambiguity solutions works generally very well, even for large 
distances to the GPS ground receiver stations. But constant or 
systematic errors can occur, especially in comparison with the 
photogrammetric camera / image system. Precise calibration of the 
multi-sensor system becomes more mandatory the more the GPS 
positioning is used in absolute terms. It seems advisable, whenever 
possible, to leave some degrees of freedom open in the combined 
system to be determined externally, by ground control for instance. 
It is recalled that this paper only refers to preliminary results of the 
first test flight Vaihingen. The investigations of the OEEPE Working 
Group are continued. It remains to be seen whether the further tests 
will confirm the preliminary results, before final conclusions can be Aii 
drawn. Further reports are to published in due time. 
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6 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B6. Vienna 1996