T TT 
  
The following t&bulation shows the situation interpreted in terms of the re- 
cording of the various points (Nos. 1-9) by the various camera stations (Nos. 
T, II end III) 
  
Point Type of Point Camera Stations at which the point was recorded 
Nos. | T II IIT 
i A: > x 
2 O - x 
3 © x x 
4 O - x x 
2 O x - 
6 O x 
T A - x 
8 © x x - 
9 A - X - 
  
Counting the cross marks, we see that 19 individual rays are present, Each 
ray leading to 2 equations, we have, 19 x 2 = 38 observation equations for the 
55 unknowns which (assuming for example, the three elements of interior orien- 
tation of each camera orientation as known) are composed of 3 x 6 = 18 elements 
of orientation and (9 x 3) = 12 = 15 coordinates of the model. As an inter- 
esting by-product, it may be mentioned, that the evaluation of the chosen 
problem, although slightly overdetermined, would not be possible with con- 
ventional restitution equipment and techniques, because there are only a 
maximum of 4 intersections between corresponding rays of any one pair of photo- 
graphs, as can be seen from the above tabulation. 
. With the help of this tabulation we form the corresponding 38 observations 
&l equations which are shown schematically in Fig. 6, In Fig. 6 each line 
represents an observational equation formed according to formulas (18) with the 
terms given in formulas (15), (40) and (41), The individual A matrices and 
similarly the corresponding P -matrices actually &re & sequence of completely 
separated sub-matrices. An inspection of Fig. 6 shows the fact, which has 
already been mentioned, that in case there are no V's, the À matrices become 
& sequence of unit matrices. 
46 
  
No. of observation equations 
+ 
OW aN OPN =