66 
  
  
  
m, 
360— 
m 
1404 
my 
120-] 
60 
T T Tr T T T — 
10 20 30 40 50 60 
Diagram 15. Ordinary aerial triangulation. Standard error of the model coordinates. 
Cantilever extension. s, = 1. 
0 
Substituting the expressions 
i Rn n 
À (n — à)? 6 (2% — 1) (n — 1) (267) 
1=1 ) 
1 n n 
^n i Y (n 1) (268) 
i21 -" 
into (266) we find 
n 
Doi, Fi (2% — 1) (a — 1)? Que + nQ,py A n? Qu, 4- n (n 1) 5Q,,,, 
— 2 nh Qo (269)