The possibilities of new optical systems for mono- and stereoin 
terpretation of aerial photos and satellite images. 
A description is given of the "Zoom Sight 20 x", "RK 820" and the 
"Stereo Measure Interpretation SMI 2" (a stereo sensor). All three 
systems have been developed and produced by KERN & Co. 
Aarau /Switzerland. 
With the aid of fixed programs and interpretation keys to be 
applied on a case-to-case basis as well as the provided periphe 
ral equipment will more or less cover a wide range of questions 
in the field of aerial photography and remote sensing, thus 
solving problems within a short period of time and on a scien 
tific basis. 
Apart from the determination of target coordinates, it is possible 
to change the image reproduction which affects the resolution, 
enlargement, image section determination, focusing and gray- 
level distortion. 
Such manipulations may include the following functions: Posi- 
tiv/negative switching, gamma correction, black-level control, 
brightness adjustment, detail intensification, image rotation 
and accurate point marking. 
By means of examples from daily use the possibilities of these 
systems are presented as aids for mono and stereo interpretation 
with both analog and digital applications.