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In the following a simple practical example is introducted to clarify the above 
mentioned problems and to show the practical potential of the data-snooping 
technique. 
Although in Grün /11/ Pope's approach of the gross error detection problem was 
emphasized, in this paper Baarda's approach is used because the values of the 
Tau - distribution (Pope /17/) are not available for the author by now. 
Another interesting method was proposed by Benning /4/ which should also receive 
future attention. 
For further demonstration the practical example of Figure 2 is introduced, based 
on synthetic data. 
  
  
  
  
  
  
  
  
  
  
  
5... contro] points 
o... points to be determined (new points) 
e... Camera stations 
Figure 2: Network arrangement for the demonstration 
of accuracy and reliability problems 
We suppose a cube which contains 27 regularly distributed points; 8 of them serve 
as control points, the others are new points. The camera stations are denoted by 
nos. 0, ..., B8. 
Table 1 shows the orientation elements of the individual images.