The results obtained are most promising. The expected
improvement of aerial triangulation by navigation data
is confirmed. It is especially the great reduction of
ground control to the minimum case which will be of
great econonimic importance. Medium and small scale
mapping projects could become not only more cost
effective but certainly much less time consuming,
because the procurement of control points could be
omitted.
It should be kept in mínd that the discussed results are
achieved by simulation studies which did not consider
any drift parameters or any provision for modelling
systematic errors. Also special error properties (for
instance correlation) and the influence of interior
orientation errors, especially in case without ground
control have not yet been considered. More detailed
investigations will have to follow.
Results gained with simulated data lead to useful
perceptions about elementary relations but they can not
be transfered unrestrictedly to practical data. However,
it can be safely expected, that the main conclusions
drawn here will remain valid. A validity test of the
achieved simulation results by a photo flight mission
with a GPS satellite receiver is planned in the near
future.
References
/1/ Ackermann, F. (1984): Utilisation of navigation
data for aerial triangulation;
Presented Paper, Comm. III, ISP Rio de
Janeiro,. 1984, pp 1 - 9
/2/ Klein, H. (1976): Genauigkeit von Hôhenblôcken mit
gemeinsamer Ausgleichung von Statoskop- oder
APR-Hilfsdaten; Proceedings Nummerische Photo-
grammetrie (111), Institut für Photogrammetrie
Stuttgart, 1976, Heft 15. 5 - 19
/3/7 Goldfarb, J. M; Schwarz, K. P. (1985): Kinematic
positioning with an integrated
INS-Differential GPS; Proc. lst Int. Symposium
on Precise Positioning with Global Postioning
System, Positioning with GPS - 1985, Vol. II,
pp. 757-- 772
/^/ Schwarz, Kı P.; Fraser, C. S.; Custafson, P.C.
(1984): Aerotriangulation without ground
control, presented paper, Comm. T, ISP,
Rio de janeiro, 1984, pp 237 - 250
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