of free adjustment, which is characterized by a minimization of the 
trace of the covariance matrix of the adjusted object coordinates (/3/). 
Figure 2 shows the ground-plan of the object points (marked by circles) 
and of the perspective centres of the selected orientation images 
(marked by crosses) for a simulated flight. 
  
o 
8199 5 0 0 00 00 0 0 0 o o o 9 O c gj c 
A— 1 
I 
Vo 
+ O. 
ON 
= flight 
A ol rre Dee ei ek e e ne eui 
A path 
X ,; 
oo 
o 
| $t. 
> 
3 
JY[° © 5 0 5 0.0.0. 50.0 9.9.6.9 0 0 o4 
  
  
  
-1000 -500 600 400. 00 —— 9 .. — 200 | 400 ui. B20. Bod 
i000 
x — axis (in meter) 
- Figure 2 - 
The project parameters for the simulations are: 
calibrated focal length 52.0 
mm 
Spacing forward / vertical sensor 20.8 mm 
Spacing vertical / backward sensor 20.8 mm 
Standard deviation of image coordinates g 5.0 um 
object points ‘9 60 
x-interval of object points 100 m 
y-interval of object points 400 m 
z-coordinate of all object points Om 
flying height 1000 m 
image scale 1:19200 
number of orientation images 9 
distance between orientation images 237.5. m 
In figures 3 - 5 the standard deviations O%js Oÿj, 02j Of the coordi- 
nates 24 91: 24 of the object points are represented graphically. Points 
along the axis of the strip (marked by circles) are distinguished from 
points along the borders (marked by full circles). The standard devia- 
tions of the points along the axis resulting under the assumption of 
known and error-free parameters of the orientation images and describing 
the theoretical accuracy limits are marked with crosses. 
- 216 ~