International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004
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1.3 5
55 432 1
-1 7T 7T 53.1
5 5 5
7 7 7 -1
Fig. 2: Multi-overlay at a 60% layout (top) vs. 80 % forward
overlap (bottom). The number of frames and intersecting rays
(top line) doubles, but the redundancy (i.e. 4 of observations — 3
coordinates of the tie point, bottom line) increases by a factor of
up to 7 times.
4.4 Multi-Ray Matching for AT
The positive impact of multiple overlapss becomes obvious
when comparing the results from aerotriangulation. We
demonstrate this by a small strip with 11 images. The
aerotriangulation was performed twice, once by excluding
every second image and therefore reducing the overlap to 70 %
(cf. Fig. 3a) and secondly by processing the triangulation for the
entire data set resulting in a forward overlap of about 85 % (cf.
Fig. 3b).
Fig. 3a: Results from the aerotriangulation by MATCH-AT of 6
images at about 70 % forward overlap (Project A).
Fig. 3b: Results from the aerotriangulation by MATCH-AT of
11 images at about 85 % forward overlap (Project B).
Project A (6 images @ 70% forward overlap)
Signe on, tL.65 pm
Based on
found 193 points connecting 2 photos
found 344 points connecting 3 photos
found 184 points connecting 4 photos
Number of observations 4437
Number of unknowns 2229
Redundancy 2208
Mean standard deviations of terrain points
X ti 0.019 [meter]
y t 0.025 [meter]
z + 0.102 [meter]
Tie Point z quality by
Number of links/Standard deviation
4 zZ +0,077 =- +0.060 [meter]
3 z t0.158 - 10.082 [meter]
2 z =:+0.287 - 40.160 [meter]
Project B (11 images @ 85% forward overlap)
Sigma oi... £1.75 pum
Based on
found 48 points connecting 2 photos
found 80 points connecting 3 photos
found 116 points connecting 4 photos
found 160 points connecting 5 photos
found 146 points connecting 6 photos
found 173 points connecting 7 photos
found 47 points connecting 8 photos
Number of observations 8244
Number of unknowns 2394
Redundancy 5850
Mean standard deviations of terrain points
X t 0.016 [meter]
y i 0.020 [meter]
Z + 0.085 [meter]
International Arc
ee
Tie Point z q
Number of lin
8 z 140,043
+0.046
2 +0.059
z +0.065
zg 40.052
z E0110
z 20.160
Table 1: Sta
The results of |
overall geometric
Proect A by a
detected, when
points. We show
point could be m
clear impact on
deviation with 8
images).
42 Multi-ray N
Based on a nov
output of a DSM
was processed an
Fig. 5: Automa
Result from 2
rays (bottom) sh