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matching parameters. Least squares matching methods are used 
to achieve more precise matches for all the matched features 
and for the identification of some false matches. Finally, the 
interpolated regular DSM grid from the matching results is 
derived. 
The authors expect to present the first results of a comparison 
between two DSMs of the same area, one extracted from SAT- 
PP and one extracted from Match-T, at the conference. 
5. CONCLUSIONS 
Recent developments in modem navigation and earth 
observation over the past four years have resulted in reliable 
UAV platforms for photogrammetric surveys. Typical products 
are 2-cm seamless orthophotos, three-dimensional vector maps 
with a relative point precision of 2 cm in XY and 4 cm in height 
and dense DSMs of approximately 50 points per m2. 
For mapping updates of smaller areas of 10 up to 100 hectares, 
there are various benefits of an autonomous UAV over 
traditional aircraft operations. These are related to mobilization 
costs, flexibility, number of operational flying days, very high 
resolution data, and high point density DSMs. UAV 
photogrammetry also has great potential to become a valid 
alternative to terrestrial geodetic surveys, especially to risky 
survey work along highways and train tracks, and other 
dangerous or inaccessible terrain. 
Future work will focus on enhancing system performance of 
UAV photogrammetry. 
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