The simulation scenario is summarized in table 1. The 
simulation numbers 7 to 14 are combined to all standard 
deviation levels of the navigation data (PO to P5). The 
simulations numbers 15 and 16 are combined to a more 
detailed group of standard deviations for the observed 
exterior orientations which is given in table 3. The 
purpose of these additional simulations is to get a 
better description of the accuracy behaviour of a bundle 
block as function of the "accuracy of the navigation 
data. 
Remark: The ground control cases C3 and C5 were solely 
used without navigation data, for comparison with 
conventional aerial triangulation. 
2.3 Principle of the accuracy analysis 
The simulation program first established the true 
terrain coordinates X, Y, Z of all object points and the 
corresponding image coordinates x, y, in relation with 
the coordinates X,., Ypc* Z»c of the projectíon centres 
and the camera rotations Ww, § 5K defined according 
to the flight assumptions. Then for each case 
observation data were simulated by a random generator, 
taking the presented standard deviations into account. 
The generated observations (image coordinates and 
auxiliary data) were processed with the extended PAT-B 
program for bundle block adjustment. The simulations 
were repeated several times in each case in order to 
obtain sufficient precision for the derived accuracy 
parameters (see below). 
All terrain points of the adjusted blocks are used as 
check points (except for control points). The check 
points are technically introduced into the bundle block 
adjustment as ground control points with the standard 
deviation infinite, 1. e. with weight zero. On the 
other hand the points used as ground control got the 
standard deviation zero. Thus their coordinates are 
treated as error free. 
The object coordinates of the check points as computed 
from the joint block adjustment were directly compared 
with their true values. The root mean square values p,, 
B, B, of the differences between adjusted and true 
coordinates represent the absolute accuracy of an 
adjusted block. They are used for the accuracy analysis. 
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