Öland Test Field 1965 
dr'micron 
Universal Aviogon 324 
Spectrozonal 
Aviogon R3 
Magazine 161 
dr’^im 
1 +Without correction 
E o With correction 
Fig. 3.11:11. Radial distortion curves and standard errors of 
unit weight of image coordinates from partial calibrations of 
photographs from a reseau camera. The grid (circle) method. 
There are no significant differences found in the radial distor 
tion curves or in the root mean square values of the standard 
errors of unit weight before and after the corrections of image 
coordinates with the aid of the reseau. The rms-values are 4.6 
and 4.5 ¡um respectively. 
Öland Test Field 
Aviogon 196 
Fig. 3.11:12. Results of partial calibration of color aerial 
photographs. The grid (circle) method. Flying altitude 1300 
meters. Kodachrome on acetate base. Averages of two experi 
ments. The root mean square value of the standard errors of 
unit weight is 10 /tm. 
Fig. 3.11: 13. Radial distortion curve from partial calibration 
of an aerial photograph (spectrozonal, multi-layer emulsion on 
acetate base). The Oland test field. Flying altitude 1300 meters. 
The radial distortion from a polynomial of fifth order. Two scale 
factors. Standard error of unit weight 17.8 /rm. 
Fig. 3.11: 14. Theoretically expected standard errors of image 
coordinates in aerial photographs, derived from possible sources 
of error as functions of the radii from the center point (the fully 
drawn lines) and the corresponding empirically determined 
standard errors of unit weight with confidence intervals (level 5 
percent), obtained from partial calibrations in 1965 and 1966. 
Oland test field, grid (circle) method, two scale factors. Upper 
diagram acetate base, lower diagram polyester base. Ref. A. 
Moren. 
micron 
Fig. 3.11: 15. Comparison between theoretically derived standard 
errors of image coordinates in aerial photographs and empiri 
cally determined standard errors of unit weight as in Fig. 3.11:14. 
The grid (circle) method, two scale factors and one factor for 
lack of orthogonality. Polyester film base. This basic accuracy 
of image coordinates can be made full use of in analytical 
photogrammetry only, where proper corrections can be applied 
to the image coordinates. The results shown in Fig. 3. 11:14 
refer to analogue methods.