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Considering only one photogrammetric system,i.e. one camera, one 
carrier etc., strips flown at different photo scales may lead to 
a similar effect. In our case of the two réseau cameras involved, 
combined use of 1:11,000 and 1:5,500 photography is advisable. 
Here also a combination of different systems for calibration is 
possible, provided the test area has not suffered alterations 
in targeting. 
  
For economical reasons only some calibrations have been computed 
using these more expensive procedures. 
(2) Variations of control pattern have also been investigated. Former 
computations showed that one needn't densify control lest there 
is want of photography (less than our "standard case" defined be- 
fore). 
  
Full control only at the corners of the area (4 points) does not 
suffice. An additional height control in the centre of the area 
is the least requirement. Height control for all targeted points 
is economically feasable in flat terrain. Having spare point 
heights for check is a means for proving the quality of calibra- 
tion. 
6. CALIBRATION RESULTS 
6.1 GENERAL REMARKS 
Optimum partial field calibration is reached, if the residuals of 
photo coordinates after adjustment approach the noise level to be ex- 
pected (Ellenbeck 1976, Kupfer 1973). This implies stationary systema- 
tic errors. On the other hand high redundancy of observations must be 
given to get significant results. Using only sparse geodetic control, 
at least the "standard case" of flight lines has to be applied, i.e. 
four lines crosswise at 1:11,000 scale, thus avoiding gross deforma- 
tions of the object space (Thomas 1976). 
Hence the following terms serve as indicators for judging the 
results fo calibration: 
Oo rre standard error of unit weight after adjustment 
m, .... PUse in planimetric coordinates, computed from differen- 
y ces dx and dy between photogrammetric and geodetic co- 
ordinates of object points 
> 
n eli tx) 
1 
Xy 2n 
where n .... number of check points; 
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