The advantage of the process of digital photogrammetric
restitution lies in the fact that a higher accuracy than
in graphical plotting is achieved and that in the computer
program, for example, the following requirements can be
satisfied:
- consideration of influences of the earth's curvature
and refraction,
= trangformation of data into the required map projection
system,
- introduction of subprograms for generalization to derive
maps at different scales.
The results are represented cartographically in the usual
form in off-line operation on the DZT 90x120 Digital brewing
able.
Due to the high photographic quality achieved with the MKF-6 M
on special Soviet Type 18 film, the photos have & ground
resolution in channel 4 (640...680 nm) of about 10 m for
linear features and about 15 m for isolated objects. The
original negatives of channel 6 (790...890 nm) with the
Soviet Type I840 infrared film have & photographic ground
resolution of about 20 m for linegfestures and about 30 m
for isolated objects.
For measuring the complex system error in the digital photo-
grammetric restitution of MKF-6 space photographs of Soyuz 22
use was made of the STECOMETER C precision stereocomparator
and the ASCORECORD 3 DP monocomparator of Jenoptik Jena and
a computer program for analytical aerial triangulation. As
control points and check points map contour points of street
crossings were used and their coordinate values taken from
a topographic map at the scale of 1:10 000. A single photo
pair and an image series of 2 photo pairs were investigated.
A comparison of the coordinates calculated by analytical
aerial triangulation with those taken from the topographic
map at the scale 1:10 O00 yielded for one photo pair a
mean position error of +32.5 m (on ground) or +16 ‚um (in
the photo plane) for the STECOMETER measurement and +17.5 m
(on ground) or +9 jum (in the photo plane) for the ASCORECORD
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