PROCESSING OF NON-PHOTOGRAMMETRIC DATA IN COMBINED BLOCK 
ADJUSTMENT 
Günter Strunz 
Technical University Munich 
Munich, FRG 
ABSTRACT 
A short review of some types of non-photogrammetric data, 
that might be used for aerotriangulation, is given first. 
Then the mathematical model for including these data in a 
photogrammetric block adjustment is described. 
Some computational aspects concerning impacts on the 
structure of the resulting normal equation system are 
discussed and a concept for processing these data in a 
combined bundle.block adjustment is given. 
Finally an attempt is made to give an outlook on some 
future investigations in combined point determination. 
1. NON-PHOTOGRAMMETRIC DATA IN AEROTRIANGULATION 
1.1. Data from classical geodetic measurements 
Non-photogrammetric data are required for photogrammetric 
point determination to balance the datum deficiency or 
configuration defects of the block and/or to have re- 
dundant information for accuracy reasons. 
Normally coordinates of control points, which are derived 
from geodetic measurements, are used for that purpose. The 
original observations, from which the coordinates in gene- 
ral are determined, can be e.g. slope distances, horizon- 
tal angles or directions, azimuths, vertical angles, ele- 
vation differences, etc. 
There are reasons that may justify introducing these ori- 
ginal measurements into the block adjustment, e.g. (see 
also Torlegárd /12/): 
- When the adjustment of a complete geodetic network is 
not possible, i.e. only local measurements are given. 
- When there are errors in the measurements, the detection 
and localization are much more effective with the original 
observations instead of "derived observations", e.g. co- 
ordinates, especially when the geodetic network shows 
geometric weakness or little reliability. 
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