97 
6.1. Some examples of the influence of the atmospheric refraction and 
the earth’s curvature in convergent aerial photogrammetry 
In the diagrams 25—40 some influence upon the image coordinates, 
y-parallaxes, and enlarged model coordinates of the refraction and the 
earth’s curvature are demonstrated under specialized conditions. Viz. 
c— 150mm AÀ-—5000m ¢, = -—0%0,= 20° h=1,23h 
Basic data concerning the refraction were taken from LEIJONHUFVUD 
1950. N and H indicate nadir- and principal points respectively. 
  
  
  
  
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