$α$ and $β$ are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being S and f respectively. Parallax displacement of the point due to relief, is

- 1
  
  $\frac{h \tan α}{S}$
- 2
  
  $\frac{h \tan β}{S}$
- 3
  
  $\frac{h (\tan α + \tan β)}{S}$
- 4
  
  $\frac{h (\tan α - \tan β)}{S}$

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