A 
  
  
  
  
  
  
  
Figure 5.1 
The following instruments were used, 22 Wild A7, 8 Stereoplanigraphs, 12 Wild A8, 3 Stereometrographs, 1 APC 
Plotter and 5 Stereocomparators (1 Watt and 2 Stecometers). 
Curvature of earth was corrected for by at least 17 participants. 
The following transformations were used, Helmert by 24 participants (probably 36), conformal by 11 participants, 
affine by 1 participant and a special analytical method by Prof. R.S, Halonen in Finland. 
  
The Algol program mentioned was used by 7 participants, and a program from The Geodetic Institute of the Techno- 
logical University in Delft by 3 participants. 
Basic data and the number of gross errors are presented in the tables 5.1 and 5, 2, (Gross errors are excluded from 
  
the Experiment). 
Table 5.1 Survey of the number of basic data of the International Photogrammetric Experiment Pecny ^ 1966-1968. 
  
  
  
  
  
  
  
  
  
Negative scale Number of 
Model meas, | points| measur. | points with | correct |5 in 9o of 4 
model,|in mod. | points gross errors | points 
1 2 3 4 5 6 2 
1:3 500 
1845/46 62 93 3286 238 3048 | 4. 
1846/41 62 o1 3162 260 2909 8.2 
1:6 000 
1828/29 63 51 3213 311 2902 a 
1829 /30 98 41 2378 223 2155 9.4 
1:12 000 
1819/21 58 58 3364 307 3037 9.7 
1821/23 98 2 3016 297 2719 9,9