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The development of unmanned aerial vehicles (UAVs) and continuous price reduction of unmanned systems attracted us to this\udresearch. Professional measuring systems are dozens of times more expensive and often heavier than "amateur", non-metric UAVs.\udFor this reason, we tested the DJI Phantom 2 Vision Plus UAV. Phantom’s smaller mass and velocity can develop less kinetic\udenergy in relation to the professional measurement platforms, which makes it potentially less dangerous for use in populated areas.\udIn this research, we wanted to investigate the ability of such non-metric UAV and find the procedures under which this kind of UAV\udmay be used for the photogrammetric survey. It is important to emphasize that UAV is equipped with an ultra wide-angle camera\udwith 14MP sensor. Calibration of such cameras is a complex process. In the research, a new two-step process is presented and\uddeveloped, and the results are compared with standard one-step camera calibration procedure. Two-step process involves initially\udremoved distortion on all images, and then uses these images in the phototriangulation with self-calibration. The paper presents\udstatistical indicators which proved that the proposed two-step process is better and more accurate procedure for calibrating those\udtypes of cameras than standard one-step calibration. Also, we suggest two-step calibration process as the standard for ultra-wideangle\udcameras for unmanned aircraft

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

TWO-STEP CAMERA CALIBRATION METHOD DEVELOPED FOR MICRO UAV'S