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Abstract: Collinearity condition equations are one of the most fundamental equations in analytical and digital photogrammetry. They have different forms and applications in photogrammetry, such as the computation of internal and external orientation parameters of the photograph and computation of ground coordinates of points that can be identified the successive overlapping photos. This study discusses the results of applying two terms of collinearity condition equations, one consists of 6-terms and the other consists of 10-terms on a photo a stereo-pair, consists of 20 control points, acquired by an aerial camera. It was found to be that for the metric camera the two algorithms relatively produces the same precision. Therefore, in aerial photogrammetry, it is sufficiently enough to use the model of 6-terms collinearity condition equations for topographic mapping. This will certainly reduce the cost of establishing more ground control points.