Study the accuracy of digital close range photogrammetry technique software as a measuring tool

Abstract

This paper presents a study of accuracy of a digital technique that uses a computer photogrammetric software which is PhotoModeler, this one based mainly on two mathematical theories to determine some measurement quantification, Direct linear Transformation (DLT) and Scale Invariant Feature Transform (SIFT) will be discussed as an explanation of the software technology. A set of laboratory experiments were prepared as a comparison with the traditional techniques, a try to assess the highest possible accuracy of the software and to demonstrate if it matches the proposed standard values, The pilot recommendations were also taken into account in the conduct of the tests as well as in the creation of projects by the software. These experiments focused on study of the accuracy of length monitoring and size measurement, the observation of the ground cartesian coordinates as well as the camera format size calculation. The results show that this technique could be relied upon effectively in some different measurements rather than traditional methods. Keywords: Digital Close Range Photogrammetry (DCRP), PhotoModeler, Laboratory experiments, Sofware, (SIFT), (DLT)