The regression of point -height (p-z) errors of comparison points upon the residual p-z errors of the five control 
points for the three first models, 
The error surface of the photogrammetric radial error in space for the two models for the three negative scales. 
The error transition from model one to model two for all three negative scales. 
2. TEST FIELD, (Plan in appendix 2.1) 
The test -field Pecny” in the neighbourhood of an astronomic observatory in Czechoslovakia covers an area of 
2.5x2,5 km with more than 300 signalized points, There are 5 given pass-points and about 45 comparison points 
for the first models and about 45 comparison points for the second models. The signal types and number of e í # 
points are indicated. in the following table, 
Signal type 
  
par TT] 
  
  
  
  
  
  
     
   
    
   
  
  
  
  
     
   
  
  
  
    
  
  
Negative scale Pass points Comparison point 
Cross | Square Cross [Square 
1:3 500 
triangulation 2 3 9 18 
traversing 77 e é 
1:6 000 
triangulation 2 3 21 66 
1:12 000 
triangulation 3 2 19 92 
  
  
  
  
  
  
The triangulated points have a standard error in x and y of 2 cm:s and a standard error in height of 1 cm. The point 
and standard error of the traverse points are not known, but are supposed to be comparable with those of the triangu- 
lated points, This information is given by Mr. Pichlik in Czechoslovakia, He used the same signal dimension for 
all three negative scales, This decision was based upon his study "The influence upon stereophotogrammetric accu- 
racy of the dimension of measuring mark and signal”, Report 155 from 1964,