COMMISSION III 
AERIAL TRIANGULATION 
1. Ackerman, F. 
Ebner, H. 
Klein, H. 
Germany (F.R.G.) 
COMBINED BLOCK-ADJUSTMENT OF APR-DATA AND 
INDEPENDENT PHOTOGRAMMETRIC MODELS 
Abstract not provided. 
2. Badekas, J. 
Greece 
A RIGOROUS TREATMENT OF THE EFFECT OF 
SYSTEMATIC ERRORS IN BLOCK TRIANGULATION 
The effect of systematic errors in strip or block triangulation is often studied by applying systematic image 
deformations of basic patterns and determining their effects on control points spaced in various places of 
different shape strips or blocks. 
Here the solution with systematic errors is treated as one where some parameters have been omitted. The 
meaning of the recovered parameters, and of the associated variances, are discussed and their relations with 
the previous approach is established. 
Some numerical examples are given and conclusions for the value of modelling systematic image errors are 
drawn. 
3. Baetslé, P.-L. 
Hoebeke, G. 
Belgium 
PLANIMETRIC INTERPOLATION 
Abstract not provided. 
4. Bauer, H. 
Müller, J. 
Germany (F.R.G.) 
RAISING THE ACCURACY IN HEIGHT BY IMPROVEMENT OF 
THE IMAGE COORDINATES IN THE BLOCK ADJUSTMENT 
ACCORDING TO H.H. SCHMID 
To produce the map 1:5 000 in Germany, control points for plotting are to be determined with a standard 
deviation of 1 to 2 d" (nearly a half foot) in height. The problem now is to obtain this accuracy by 
aerotriangulation in an economic manner, that means a scale of photos 1:12 000 or smaller and the bridge over 
a distance of four or five models at least. 
Up to now, the height accuracy in the aerotriangulation according to Schmid (bundle adjustment) is smaller 
than the horizontal accuracy. Besides, the z-coordinates are influenced by systematic errors. An attempt is made 
to raise the accuracy in height and to reduce the block deformation by introduction of additional unknowns 
into the adjustment, which improve the plate measurement. The additional unknowns remove the influence of 
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