Ui. amy 
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Fig. l. A distortion curve. The influence upon the y-parallaxes of the model of the 
radial distortion is demonstrated in fig. 2. 
  
and concentrate upon the determination of the y-parallaxes which are 
caused by the distortion. Then we will determine the influence of such 
y-parallaxes upon the elements of the relative orientation, and finally 
the corresponding influence upon the model elevations before and after 
the absolute orientation. 
We assume the radial distortion of the reconstructed pencils of rays 
to be known (fig. 1). 
  
= 
dr, 3 
  
  
  
  
  
Fig. 2. The photogrammetric model as seen from above. 1—6 are the symmetrical 
model points where the y-parallaxes normally are corrected for the relative orien- 
tation.