Cycle Na 
Image strip As VIN Image point 
XA; YA 
  
  
  
  
  
  
  
  
  
  
  
  
  
       
   
   
  
MEET 
nn 
= 
  
Cycle Ng 
Image point 
Xg, ¥8 
  
     
Image strip Bg 
   
   
     
  
  
  
Cycle Nc 
image point 
Xc, Yc 
Image strip Cs 
  
  
Vv 
Figure 5. Correlated image points in the image strips 
2.3 Model compilation 
Correlation is followed by the determination of the orientation para- 
meters in the so-called update points P. along the flight course and of 
the DEM points P: in a closed and rigordus analytical process of bundle 
adjustment. 
This is performed by the setting up collinearity equations for the 
three rays belonging to one DEM-point. They are formed by the corre- 
lated image points, the perspective center and the intersection DEM- 
point Ps. They are of the following form: 
; a 44 0,79) 8324 (07 Yu) 8244 (Z; 7 ZA) 
  
: = F {p:, k:) 
i,N S J ? x "4 1 
a43(X, 7X) *854(Y,- Yu) $244 CZ; 7Z) 
(1) 
a4o(X;7Xu)85o (Y: 7Yu)*8425(247Z4) 
=) € 12 1 IN 22 1ONN 30 libr F (pss Ki) 
a43 (X; 7X4) 8854 (Y; 7 Yu) 245 (Zi Z) 
  
Here c is the focal length, X, Ye L, are the coordinates of the in- 
stantaneous scan position of the camera for Pi at the image cycle Nps 
No: Ne» and 44 «+. Azz are the coefficients of the matrix of rotation 
- 349 -