Diagram 5. 
  
dr mm 
50 100 
l 0,005 
o Oo 
A a d. a 
-0,005 r mm 
  
c — 99.996 mm 
The values of the distortion do not show significant deviations 
from 0. 
[t 1s obvious that the distortion effect as demonstrated in diagram 4 
mainly was caused by the x-inclination and latitude-distortion errors. 
Consequently, the adjustment situation of the instrument is very im- 
portant. The indicated method can be used for a check of this adjust- 
ment situation. 
The grid method can also be used for a complete determination of the 
inner orientation of all kinds of cameras. The inner orientation of 
aerial cameras can be conveniently determined from photographs of 
grids from sufficiently high towers. 
References 
1. Hallert, B.: A New Method for the Determination of the Distortion and the 
[nner Orientation of Cameras and Projectors. Photogrammetria, XI 
1954—55, 3. 
2. Hallert, B.: Über die Fehlertheorie der Aerotriangulation und einzelner Bild- 
paare. Zeitschrift für Vermessungswesen, 1955, 10, 12. 
3. Ottoson, L.: Determination of the Radial Distortion of a Multiplex Projector. 
Photogrammetric Record, April 1956. 
4. Rehnlund, E.: Determination of Some Systematic Deformations of the Pen- 
cils of Rays of Photogrammetric Plotting Instruments. Fotogrammetriska 
meddelanden. Vol. II Nr. 5. Stockholm 70. 1956. 
5. Lycken, L. E.: Numerical Adjustment of x-inclination and Latitude Distor- 
tion in Stereoscopic Plotters. Svensk Lantmateritidskrift 1956. Congress 
Number 
  
ra 
In’ 
doi 
tir 
fun 
ced 
acc 
mai 
the 
sho 
the 
suc 
men 
qui: 
fron 
vidu 
1.1