mode). In general, the zoom capability should be
improved as well.
5. CONCLUSIONS AND OUTLOOK
Digital aerial triangulation was performed with two
test blocks, St. Gallen and Zug, using HATS. It was
found, that HATS including the highly automated
measurement procedure is a powerful triangulation
tool, which can be recommended for use in
production. To increase the efficiency of the digital
triangulation, HATS has still potential for
improvements as mentioned above. During processing
the AT using beta version of HATS 3.1. problems
occured, which could be solved in coorperation with
experts from Helava. In experience, it can be
summarized that for such a complex and highly tuned
software package like HATS extensive training and
well documented user manuals are absolutely
necessary to be capable of driving through problem
situations with the software.
The achived results of better than 1m in planimetry
and in height is not satisfactorily using images with a
photo scale of 1: 27°000. But we have to be aware that
the ground control resp. check points were not of a
very good quality, which influences the results
significantly. Although the results are approximately
the same using different tie point patterns, we
recommemend the use of the dense tie point pattern
for more reliable connecting of the block. AT using
the conventional amount of ground control is time
consuming and requires a lot of resources. Using only
the minimum ground control of 4 points with
additional height control and the GPS photo centre
coordinates can speed up and automate the process
significantly. Thus, the goal for using the recorded
* GPS photo centre coordinates is to avoid time
consuming efforts for providing sufficient control
points from various resources in a optimal
configuration and distribution, and in sufficient
accuracies.
However, we think, that we can reduce the time
needed and the manual intervention of the operator
significantly for GPS supported aerial triangulation in
the future to produce much more efficiently. We hope
that we can triangulate more than 40 images per shift
using HATS in the near future.
596
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996
6. ACKNOWLEDGEMENTS
The investigations for this paper were supported by
the SWISSPHOTO team, by the very good
cooperation with Helava Associates Incorporated (San
Diego), and by some bundle adjustment computations
of Dr. K. Jacobsen (University of Hannover). Their
support is gratefully acknowledged.
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