330 
Fig. 1 
The System 9-AP analytical workstation. The central part is the analytical measuring 
unit with its oculars and handwheels. The plate holders with the aerial photographs lie 
under the surface of the table; the two screens for image injection are integrated in the 
lower part of the instrument. The computer unit is on the right of the operator and the 
screen of the workstation stands on the table. 
The stereoscopic superimposition optics of an analytical plotter.