the Afga and Ilford films. First, taking into account the dif-
ferent resolutions as a factor between the test results, the
information and quality of the analog images scanned at
the different resolutions are quite similar. The conclusion
is that scanning a film image with 5/m is unnecessary be-
cause the 20;/m scan contains the same information. There
is no more information included in the film and thus can-
not be revealed by scanning at higher resolution. Second,
the digital sensed images are equal to the 20m scanned
film image in the edge response and Siemens star tests, but
outperforms the film images in stereo matching accuracy.
Stereo matching results in a 2.5 times smaller noise level
and it is possible to match also in poorly textured ares be-
cause of the absence of noise.
The conclusion of the work is that digital sensors are lead-
ing to highly accurate and robust photogrammetric pro-
cessing. The next stage is to perform these tests on syn-
chronized exposed aerial images of digital UltraCam p and
analog RMK Top from an airplane holding both cameras
on the same flight.
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