OF AERIAL PHOTOGRAPHY
COMPUTER-AIDED INTERPRETATION
of USING THE STEREOCORD G 2
dular |
eT H.Mohl, Fachhochschule für Technik, Stuttgart |
V H.W.Faust, Carl Zeiss, Oberkochen
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Abstract
Stereoscopic interpretation of aerial photography is the classic
method of remote sensing. In practical remote sensing this is
still one of the most important methods. From the stereoscopic
model the expert can recognize and measure geological, hydro-
logical, agricultural, arboricultural, and urban constructional
details.
For a long time the parallax bar was the interpreter's tool
for measurements. Today with the electronic desk calculators
more accurate and more intense investigations are possible and
magnitudes such as height differences, distances, slope and
azimuth angles, planimetric and surface areas, and volumes can
be measured on-line.
The STEREOCORD G 2 of Carl Zeiss, Oberkochen, is exemplary for
a combination of a mirror stereoscope and a desk calculator.
The aerial photographs are mounted on a photo carriage, the
position of which is continuously controlled by encoders. From
the photo coordinates the calculator computes the terrain co-
ordinates. The orientation of the photographs on the photo carriage
is simple. Tip and tilt of the photographs are determined from
the photo coordinates of some control points, and then auto-
matically taken into account for the coordinate transformation.
An important part of the system is the software for computing
the orientation, the coordinate transformation, distances,
angles, areas, and volumes. The first STEREOCORD software made
approximate allowance for tip and tilt. Now new software has
been developed which has considerably improved the system's
accuracy.