ce from
al wide
the 5-
I,
ground
on has
osition
ist be
4 can-
stand-
pear—
ard error of y-parallax measurement is
equal for both vertical and convergent
photography. This important question is
being investigated by making measure-
ments in 9 and 15 points in both vertical
and convergent models and substituting
the values obtained in formulas (8) and
(10) and the corresponding formulas for
15 points. Of course, all known systematic
errors, such as the radial distortion, must
be eliminated from the measurements
before using the formulas.
When these fundamental expressions for
the errors in convergent photographs have
been derived, the error propagation in
functions of the orientation elements may
be studied in the same manner as for verti-
cal photographs (see, for instance [7]). The
formulas are also of primary importance
for investigations of the influence of sym-
metrical radial distortion upon the model,
and for studying the error propagation in
aerial triangulation with convergent pho-
tography.
The theory of errors for w- tilted photog-
raphy may be developed in a similar man-
ner.
THEORY OF ERRORS FOR CONVERGENT PHOTOGRAPHY
REFERENCES
1.
Cn
6.
sv
Bjerhammar, A., "Adjustment of Aerotri-
angulation.” Photogrammetria II, 1950-
1951.
. V. Gruber, O., Photogrammetry. Collected
Lectures and Essays. Am. Photographic
Publishing Co., Boston, 1942.
. Hallert, B., “Über die Herstellung Photo-
grammetrischer Plane." Thesis. Stockholm
1944.
. Hallert, B., “Contribution to Theory of Er-
rors For Double Point Intersection In
Space." Royal Institute of Technology.
Stockholm 70. 1950.
. Jordan- Eggert, Handbuch der Vermessung-
skunde. Erster Band. Stuttgart 1948.
Radlinski, W. A., “Convergent and Low
Oblique Photography and Its Application to
the Twinplex. PHOTOGRAMMETRIC ENGI-
NEERING. Volume 18. Number 3, June 1952.
. Roelofs, R., “Basic Factors Limiting the
Accuracy of Mapping and Aerotriangulation
by Photogrammetric Procedures.” Fourth
interim technical report period: October 1,
1953 to December 31, 1953. Mapping and
Charting Laboratory. Ohio State University.
. Tewinkel, G. C., “Numerical Relative Orien-
”,
tation." PHOTOGRAMMETRIC ENGINEERING.
Volume XIX, Number 5. December 1953.
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