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BALLISTIC PHOTOGRAMMETRY, SCHMID 41 
gulation, are secured, but will also permit investigating specific laws of error propagation. 
It is not the purpose of this presentation to show such results in detail. However, it 
should be mentioned that by this means it is possible to determine the precision with 
which the elements of orientation and the coordinates of the model can be obtained, thus 
leading, fór example, to the deduction of the optimum size of a strip or block triangu- 
lation, or optimum number, type and distribution of control data. These questions are as 
important in non-topographic application where the photogrammetric method is used, 
for example, to calibrate navigational components, as they are in problems dealing with 
the extension of geodetic control. Furthermore, the analytical treatment provides means 
  
  
  
  
  
  
  
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for studying the significance of specific parameters with respect to the precision of the 
photogrammetric triangulation method. Hence, it is possible to determine the influence 
of flying height, focal lengths, opening angle of the camera, percentage of overlap, aux- 
iliary measurements, as for example of the sun or fixed stars, statoscope data, additional 
electronic relative or absolute position measurements, number and distribution of various 
kinds of control data ete. In short, all parameters which are of geometrical nature can 
be investigated as to their significance in propagating the errors of the fundamental 
observations into the triangulation configuration. 
Figure 1 shows, as an example, the plot of propagation factors presenting the ac- 
curacy distribution of the elements of exterior orientation in a strip of wide angle, ver-