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The paper considers the solution of the photogrammetric problem of measuring the planar objects dimensions with projective distortions that are characteristic for low-altitude photography. It is shown that a bird's eye view transformation technique allows estimating the area occupied by planar objects with a relative error of up to 5 %. Keywords—projective distortion; bird's eye view transormation; homography matrix; quaternion; three-axis accelerometer; camera calibration

Bird's Eye View Transformation Technique in Photogrammetric Problem of Object Size Measuring at Low-altitude Photography