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OEEPE, COMMISSION A, SOLAINI AND TROMBETTI 33 
Mean square error of transfer of scale and azimuth 4n aerotriangulation. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
m, 10—3 mg 10—3 
Strip x | | mss Ta TT 
Jn Ee aE 
= re o | AU = | 8 i = QM r5 = | © 
E | 0 ga [E "| # | A Em rm m hal SE | à 
1A'Re | 03. 0,3 0,5. | 08. | 02. | Fog] 102,1. 05. 
St 0,4 | | 03 0,4 0,3 | 1.08 | 0,4. 
St a.p. 0,3 | 0,3 
1A”Re | | | | | [as | | | | | 0,3. 
St | 95. | | | | 0,2. | | | | 
1A” Re | | 0,3. | | 0,4. 
St 0,3. | 0,2. | 
1BRe | | | | | 0,6. ] | 0,5. 
St | | | | 08. | 0,8. 
1C’ Re | | | | 04. | | | 0,3. 
1C"Re | | | 02 | 0,5 
1C St | 04 | 2,4 
10st | 0,7 | | | | 04 
2ARe | 0,6. | | 0,4. | 
St | '0,3. | 0.68. | | 1.7 02. | 04. | 0,3 
| | | | 
5A Re | 0,7 0,7 0,2 | 08 
6 À Re | 0,5 | | | 04 
| | 
7 A2 Re | | 
1/11 1,5 | | | 1,6 
1/111 0,7 | | | 0,3 
  
  
  
  
  
  
  
  
The results of these studies, which are not anyway of great interest, are related in 
the general report. 
The Commission has also planned out two studies of a particular character as the 
beginning of a deepened examination of the aerial triangulation errors; namely, the 
“couples témoins” and the determination of the entirely casual error along the strip. The 
“couples témoins” is a pair of photograms, the co-ordinates of several points of which 
are known. All the Centers had to plot them 24 times: 12 with an internal base, 12 with 
an external base. 
The elaboration of the plotting data has been executed according to a procedure due 
to Lemaire which had to allow the determination of the mean square value of the random 
errors of the orientation elements; the computation of the correlation coefficients; the 
computation of the mean errors of the model co-ordinates. The mean errors of the co- 
ordinates of the model points are expressed in hundredths of mm 
m, = + 2,5; m, = = 8,3; m, 5,0 
the enlargement being within 2,5 and 3. The data from which we have drawn the above 
mentioned results are very poor. The computation of the errors of the adjusting elements 
and of the correlation coefficients is very difficult and delicate; for this reason we can-