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.