matching successful
matching failed
matching successful
Figure 12: Left: distorted line in the nadir channel;
right: corresponding area in the forward channel
The last figure shows the height profile derived by
matching and provides a comparison with the GPS
profile. The noise in the matching result can be di-
rectly seen from this plot.
35
- Profile
30
N
a
N
©
-
c1
Matched -
EE
©
measured height [m]
a
0 2500 5000 7500 10000 12500 15000
profile [m]
Figure 13: Height profiles of GPS and matched data
An accuracy of 4.3 m is obtained for the height mea-
surement along the profile. With the differences in
the horizontal coordinates of the 3228 check points
a standard deviation of 0.3 m in X direction (approx-
imately along the profile) and 3.6 m in Y direction
(perpendicular to the profile) is derived. In summary,
with the area based least squares solution for MOMS
three-line images a height precision of 4.3 m is ob-
tained, which is an excellent result, verified with a
GPS profile of 16 km length.
4. CONCLUSION
This paper presents new experimental results of au-
tomatic 3D point determination and DTM generation
using MOMS three-line stereo images. The investiga-
tion focuses on images which are taken over a test-
field in Australia for which a GPS network and, what is
most important for the DTM evaluation, a 3-D profile
of about 16 km length is surveyed which gives 3228
DTM check points.
For the first time we have now been able to proof that
DTM and 3-D point determination with MOMS data
is possible at an accuracy level better than 5 m. Ex-
perimentally an accuracy of 7.6 m is achieved for our
feature based DTM solution. This accuracy could be
further improved with the developed area based least
squares procedure. The comparison with the GPS
profile shows that an excellent height precision with
an rms value of 4.3 m is obtained.
REFERENCES
Ackermann, F., Bodechtel, J., Lanzl, F., Meissner,
D., Seige, P, Winkenbach, H. [1989]: MOMS-
02 - A Multispectral Stereo Imager for the Sec-
ond German Spacelan Mission D2. In: /nterna-
tional Archives of Photogrammetry and Remote
Sensing, vol. 28, Part 1, pp. 110-116.
Ackermann, F., Fritsch, D., Hahn, M.,. Schneider,
F., Tsingas, V. [1995]: Automatic Generation of
Digital Terrain Models with MOMS-02/D2 Data.
In: MOMS Workshop 1995, Lanzl et. al (eds.),
pp. 8 pages, DLR, Cologne, Germany.
Fraser, C., Fritsch, D., Collier, P, Shao, J. [1996]:
Ground Point Determination using MOMS-02
Earth Observation Imagery. Paper presented to
the 37th Australian Surveyors Congress, April
1996, Perth, Western Australia.
Fritsch, D., Hahn, M., Schneider, F. [1995]: Au-
tomatic DTM Generation with MOMS-02/D2
Mode 1 Data. In: Remote Sensing and Recon-
struction for Three-Dimensional Objects and
Scenes, pp. 20-27, SPIE Vol. 2572, San Diego,
California, July 1995.
Hahn, M., Schneider, F. [1991]: Feature Based Sur-
face Reconstruction - A Hierarchical Approach
Developed for MOMS-02 Imagery. In: Proceed-
ings of the International Geoscience and Re-
mote Sensing Symposium, vol. Ill, pp. 1747-
1750, Helsinki.
Kornus, W., Ebner, H., Heipke, C.[1995]: Pho-
togrammetric Point Determination Using
MOMS-02/D2 Imagery. In: MOMS Workshop
1995, Lanzl et. al (eds.), Cologne, Germany.
Schneider, F., Hahn, M. [1995|: Automatic DTM
Generation using MOMS-02/D2 Image Data.
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272
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996
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