43 
m 
120 + 
Tv-50 
  
  
  
  
  
  
Diagram 9. Stereo-radial triangulation. Standard errors of the y-coordinates. Bridging. 
So 7 |. 
The standard error of a corrected Y-coordinate is 
My = 8 [7 (147) 
The expressions (144) and (147) are graphically demonstrated in the 
diagrams 8—9 for s, — 1. 
2. The independent model triangulation 
Independent model triangulation means as a principle that the indi- 
vidual models are established separately in a stereoscopie plotting instru- 
ment. Each model is levelled with the aid of at least three elevation 
a 
A 
T 
  
  
  
are