2. MATHEMATICAL MODEL 
The three line opto-electronic camera contains in the focal plane of 
an objective three linear sensor arrays a, b, c which are oriented per- 
pendicularly to the direction of flight (/4/). During the flight with- 
in each read cycle one image is recorded, consisting of only three 
lines. Generally each object point is projected into three images per 
flight strip, the points at the beginning and at the end of a strip are 
projected only into two images. If blocks with 20% or 60% sideward 
overlap are used, object points are projected into as many as six or 
nine images. 
Figure 1 represents the geometry of the imaging process. For the object 
points Pi (i=1...n), projected onto the linear sensor arrays aj, bj or 
ci in the images Ij (jsl...m) the (non integer) read cycle numbers dj 
of the images Ij and the (non integer) pixel numbers ai,j» bi,j or cí,j 
of the image points Pi,j in the linear arrays aj, bj or cj are deter- 
mined by an operator or by digital correlation. The corresponding image 
coordinates xi,j» Yi,J are derived from aij; bij Or Cij and the cali- 
brated location of the linear sensor arrays in the focal plane (in- 
terior orientation). : 
orientation image image r orientation image 
| sensor b Ike : j sensor c 
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d d d T 
k J kel read cycle number 
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Py 
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- Figure 1 - 
«213 .—