Other features of the Orthosfom 9300 will be noted: setting of the model directly with the orthophotographic 
table, seated working position of operator, restitution of super wide angle slides by an anamorphosis 
process. 
The paper additionally recalls the characteristics of the 693 orthophotograph, retained on the Orthosfom 9300: 
automatic control of the sweep speed, adjustable exposure slots, etc.., and the various peripheral devices 
connectable to it: ‘Drop line’, profile recorder. 
51.  Yoritomo, K.T. 
United States 
METHODS AND INSTRUMENTS FOR THE 
RESTITUTION OF RADAR PICTURES 
This paper is concerned with the restitution of radar photographs for photogrammetric applications. The paper 
contains a general introduction to the nature of imaging radars and to the terminology which is peculiar to 
these radars. The geometric qualities and characteristics of radar photographs are described to illustrate the 
nature of distortions that are inherent in the photographs. Early procedures and equipment for the partial 
removal of these distortions are discussed and illustrated. The subsequent phase of these developments, the full 
orthographic restitution of radar photographs, is described showing how the various types of distortions are 
detected and then removed. The design approach and the performance characteristics of a prototype 
orthographic radar restitutor are included in this paper. The paper concludes with the nature and types of 
problems which remain in restitution of radar photographs. 
52.  Zeth, U. 
Germany (G.D.R.) 
TESTS FOR OPTICAL RECTIFIERS 
On the basis of hints for standard tests given by Burkhardt, methods are suggested, by means of which optical 
rectifiers can be tested and routinely checked. Apart from the checking of the image quality and illumination, 
the paper deals especially with the checking of the geometrical imaging quality. This is done by considering 
the fact that in today's frequently used technique of rectification according to setting values, the geometrical 
accuracy of imaging (without ground-survey control) plays a significant part. 
As an integral geometrical test the transformation of a grid plate is suggested with certain instrument settings 
being given. The plotting can be made in three forms differing in their wealth of information and 
constructional volume, either by measuring a photographic image of the grid and subsequent computational 
error determination, or by using a ‘ground control point plan’, which is fitted on to the projected grid and on 
which the errors are either measured or limited by means of tolerance fields. By checking individual instrument 
components the causes of occurring errors may be determined in more detail. 
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