The HO-1 plotter works on a time-tried, simplified analog principle in conjunction with digital electronics. 
Exclusively integrated circuits are used. 
The inclined taken pictures are rectified by the real-time computer, then treated like rigorously vertical 
photography and evaluated with a fixes calibrated focal length. 
24. Höhle, J. 
Germany (F.R.G.) 
METHODS AND INSTRUMENTS OF MULTIMEDIA PHOTOGRAMMETRY 
When the imaging rays pass several media having different optical density before entering the lens, refraction 
occurs on each interface. The central projection, which is the basic concept for the usual numerical solutions 
and analogue instruments, cannot be applied. Therefore, a mathematical model for the multimedia 
photogrammetry is developed. Hitherto, the theoretical and practical reports were mainly concerned with the 
important case of two media with a horizontal boundary plane only. For this special case, the present situation 
and various problems are presented, in order to propose further investigations. The computational methods 
are of great importance. Various methods proposed by different authors, must be compared with regard to their 
accuracy and practical utility. Particularly, well elaborated computer programs to solve the different problems 
in a universal manner are not yet available. For analogous plotting, two instrument modifications have recently 
been introduced which can be developed further. In the future, the so-called *hybrid plotters’ will probably be 
used with success. To solve multimedia tasks in the laboratory and under water, in general, cameras with small 
format are used, therefore, the author recommends the construction of an inexpensive stereocomparator 
directly connected to an electronic desk computer. The orientation problem in analogous instruments and its 
modifications has not been solved satisfactorily for practical application. 
25.  Inghilleri, G. 
Italy 
A NEW ANALYTICAL PLOTTER: 
THE GALILEO DIGITAL STEREOCARTOGRAPH 
The term for the relative orientation of two bundles of rays is described as regards to the particular position 
according to which the perspective centers are on a straight line parallel to x axis. It is therefore possible to 
compute the y, coordinate of the image of a point on the right plate being known the x,, y, coordinates of the 
homologous on the left plate, the x; coordinate of the same point and 5 angular parameters establishing the 
relative orientation of the two bundles. Having then shown the used particular rectangular system, the forms 
for the model coordinates computation are given on the base of 7 absolute orientation parameters. 
Being known, the absolute and relative orientation parameters and having established the contour altitude, it 
is shown how, for xi, y; coordinates of the left plate, x», y; coordinates of the corresponding point on the right 
plate may be computed to solve the problem of the determination of a contour line. 
The computation proceedings are then described to establish all the parameters for orientation being known 
machine coordinates measured at the stereocomparator. 
The equipment forming DS is then described as follows: 
a. Galileo stereocomparator, the screws of which move 4 shaftencoders. Its right carriage is moved by a 
stepmotor (screw y;) controlled by the computer to keep stereoscopy when x, y; and x; coordinates are 
changed by hand or by two stepmotors (screws x» and y;) when x, y; are changed by hand to follow a 
contour line. 
b. LABEN 70 computer having 8K words, machine cycle 1,35 usec. fitted with interfaces for connecting 
the shaftencoders meters, for controlling the stepmotors in output and for driving the display giving the 
computed ground coordinates. 
C; Galileo drawing table on which carriages are driven by the computer through two stepmotors. Last, the 
essential operational modes of the instrument are described. 
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