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This paper reports an experiment conducted in order to investigate the feasibility of the deformation measurement of a large-scale\udsolar power plant on reclaimed land by using images acquired by a non-metric digital camera on board a micro unmanned aerial\udvehicle (UAV). It is required that a root mean squares of errors (RMSE) in height measurement should be less than 26 mm that is 1/3\udof the critical limit of deformation of 78 mm off the plane of a solar panel. Images utilized in the experiment have been obtained by\udan Olympus PEN E-P2 digital camera on board a Microdrones md4-1000 quadrocopter. The planned forward and side overlap ratios\udof vertical image acquisition have been 60 % and 60 % respectively. The planned flying height of the UAV has been 20 m above the\udground level and the ground resolution of an image is approximately 5.0 mm by 5.0 mm. 8 control points around the experiment area\udare utilized for orientation. Measurement results are evaluated by the space coordinates of 220 check points which are corner points\udof 55 solar panels selected from 1768 solar panels in the experiment area. Two teams engage in the experiment. One carries out\udorientation and measurement by using 171 images following the procedure of conventional aerial photogrammetry, and the other\udexecutes those by using 126 images in the manner of close range photogrammetry. The former fails to satisfy the required accuracy,\udwhile the RMSE in height measurement by the latter is 8.7 mm that satisfies the required accuracy. From the experiment results, we\udconclude that the deformation measurement of a large-scale solar power plant on reclaimed land by using images acquired by a nonmetric\uddigital camera on board a micro UAV would be feasible if points utilized in orientation and measurement have a sufficient\udnumber of bundles in good geometry and self-calibration in orientation is carried out

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

MEASUREMENT OF LARGE-SCALE SOLAR POWER PLANT BY USING IMAGES ACQUIRED BY NON-METRIC DIGITAL CAMERA ON BOARD UAV