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Department of Civil Engineering. University of Kuwait, P.O. Box 5969, Kuwait and Faculty

of Engineering, Cairo University, Giza, Cairo, Egypt

ABSTRACT

In photogrammetry, the concept of collinearity is based on the assumption that the object space point, the exposure station and the image space point lie on a common straight line. In practice, however, this line deviates from straightness due to different linear and nonlinear systematic errors, thus affecting the location of images on the photograph. This paper studies the effect of some important sources of error on the determination of parameters of single photo resection and orientation. By applying corrections to the photo coordinates, the mean values of the observational residuals (after a least squares adjustment) improved from 8 pm to 6 pm at photo scales. It has also been shown that both atmospheric refraction and earth curvature corrections should be either applied or ignored because of their compensating effect. Correcting for either of them alone causes deterioration in accuracy when determining the parameters.