SOME ACCURACY ASPECTS OF ON-THE-JOB 
CALIBRATIONS SHOWN AT THE EXAMPLE OF 
A PHOTOGRAMMETRIC CONTROL SURVEY 
Orhan Altan, Hanspeter Bopp 
and 
Herbert Krauss 
Institut für Anwendungen der Geodásie im Bauwesen 
Universität Stuttgart 
ABSTRACT 
The photogrammetric control survey of a 
plastie membrane covering an open-air café 
was carried out with a Hasselblad MK 70 
camera using five arbitrarily chosen camera 
stations and object space control. The data 
were processed on one hand with a rigid 
bundle solution, on the other hand with the 
11-parameter solution, programmed asa two 
Step adjustment. The results out of the 
orientation and the on-the-job calibration 
version of the 11-parameter solution are 
compared with the results of the bundle 
solution with regard to 5 configurations of 
the camera stations and different numbers of 
control points. 
1. INTRODUCTION 
At a college in Ludwigsburg (FRG) a membrane 
was erected to cover an open-air café. The 
plastic membrane is supported by five wooden 
beams with a parabolic form. The smallest 
span width is 7.5 m with a height of 4.0m 
of the summit. The beam with the maximum 
width of 20.6 m reaches a height of 9.0 m. 
The whole membrane covers an area of about 
500 m2. Detailed information about the 
construction, designed by AIC Stuttgart, can 
be found in /1/. 
For the final control selected profiles on 
the membrane and the coordinates of the 
system points had to be determined. Each 
of these profiles were represented by about 
15 markers which were sticked to the mem- 
brane. For this purpose we performed a com- 
bined geodetic-photogrammetric survey /4/, 
which was analogic to the one we reported 
about in /5/. 
In contrast to that survey of a cooling 
tower we employed a HASSELBLAD MK 70 reseau 
31 
camera with a 70 mm film (AVIPHOT PAN3OPE, 
20 DIN). 
The control point configuration and the 
position of the five arbitrarily chosen 
camera stations is given in Figure 2. 
160 
  
      
    
Evene No PO 
gg VANE 3.8 N-----EN Ce 
     
Figure 1: Photograph taken from 
camera station 1 
14 
12 
016 
20 © oV 
control points 
910 
  
A AS A! A? 
y 
camera stations 
a3 
X 
p 
30m 
Figure 2: Situation of camera stations 
and control points