OPERATIONAL ASPECTS OF DATA AQUISATION FOR BUNDLE BLOCK ADJUSTMENT 
Karsten Jacobsen 
Universitat Hannover 
Hannover, F.R. Germany 
ABSTRACT 
Advanced technics of dataaquisition for block adjustment can increase 
the cost-effectiveness very much. Using the possibilities of computer 
supported automatical approximate pointing, the structure of blocks for 
precise point determination can be changed. The used methods for on-line 
data check and the different possibilities for automatic pointing by 
analytical plotters of a program, used for production in different places, 
are described. This program is integrated into the program system for 
block adjustment BLUH of the University Hannover, but it can be used 
also together with other programs for bundle or independent model block 
adjustment. 
1. PROGRAM B159 FOR AQUISITION OF PHOTO COORDINATES 
The program B159 has been developed by the University Hannover for opti- 
misation of the aquisation of photo coordinates with the analytical 
plotter Planicomp. The results of a detailed calibration of the instru- 
ment, based on grid measurements, can be used for a correction of the 
plate coordinates. With this correction the same accuracies of highly 
accurate bundle block adjustments have been achieved with analytical 
plotter measurements like with precise comparator measurements. That 
means, it is not necessary to use time consuming comparator measurements, 
even if the comparator is more accurate than the analytical plotter. 
The accuracy limits are caused by the point definition in the photos 
and the geometric quality of the photo itself, so the slightly lower 
accuracy of analytical plotters with spindles is negligible. Also the 
influence of temperature, which is usually not negligible at the Plani- 
comp, can be reduced by the measurement sequence, so finally there is 
no reason to use a precise comparator instead of an analytical plotter 
for getting higher accurades. The data of the inner orientation can be 
read from a special camera file, so up to 25 fiducial marks can be used 
for transformation from plate to photo coordinates. The location of the 
principal point is free, that means, it is also possible to use the 
outer parts of a Large Format Camera. In addition to the fiducial mark 
coordinates, up to 125 reseau point coordinates can be read from file, 
which are not used for the transformation from plate to photo coordina- 
tes. This special group of reseau points is necessary for a reseau 
which is projected from the back of the film and where the cartridge is 
moved during exposure. That means, the reseau has a different coordinate 
system than the fiducial marks and it is not known with respect to the 
principal point, like in the case of the Large Format Camera. 
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