DEFORMATION MEASUREMENTS 
  
  
  
  
  
  
  
  
Fic. 7. '"Topographic map'' of the sea from 
the steropair figure 5. The contour interval is 
1 and 0,5 m. The planimetry scale of the original 
plotting is 1:200. 
where f is the principal distance. 
Each measured difference 
dz,.' = zp, = zp, (3) 
in a feature point p; of two pictures j and £, 
with respect to the fiducial mark or the 
frame of the camera, is assumed to depend 
N 
: ud. n 
   
841 
F1G. 9. The autograph Wild A4 at the divi- 
sion of Photogrammetry, in which the plottings 
of the maps of the sea were performed. 
upon a relative translation dz,, of the point 
in the feature and upon a rotation dw of the 
camera between the exposures. 
Thus one obtains the equations for n 
points 
dz f ( 21"? 
dz’ = — 14+—1'fd 
1 > d: + f + co 
"d... -.. >. 
  
dz, f 2,2 
bí n IM Ela ) fo (4) 
Y 7 
One of the points po is chosen as reference 
point and it is assumed that dz', in this 
point is entirely caused by the rotation. 
  
F1G. 8. A stereopair of the ship, photographed by the sterocamera from the position of thc 
phototheodolite for the determination of distances and elevation differences. The measurements 
were performed in the stereocomparator. The camera itself was checked on a special test area 
before and after the experiments.