Användning av UAS i anläggningsprojekt : En jämförelse av olika mätmetoders noggrannhet och tillämpningsområden

Unmanned Aircraft System (UAS) have in recent years increased in number and become more common. New field of applications in previously unexplored areas emerges at the same time as the UAS technology constantly evolves. In the construction industry and especially in civil engineering applications which this study covers with, the UAS photogrammetry is quite an unexplored technology and despite its ability to quickly measure and estimate various properties on a construction site. Since follow-up of cost estimates and production plans is fundamental for the success of a construction project, the purpose of the study has been to evaluate to how unmanned aerial vehicles (UAV) can be used to monitor the production progress of civil engineering works.The result is based on a field study in which a UAV from the manufacturer 3D Robotics is used. The author made a reconstruction of camera equipment to adapt the UAV for UAS Aerial Photogrammetry. The reconstruction included camera, tripod, cables, protective casing and memory cards for programming the camera. To evaluate the accuracy of the UAS photogrammetry, the measurement was compared with total station measurements and terrestrial laser scanning. All measurements have been performed on hard flat and hilly surfaces. Flat single points from the UAS photogrammetry RMS measurements were compared with laser scanning using RMS (Root Mean Square) values. As reference for the measurements values from the total station were used. Accuracy in height of 9 mm was obtained which is the same precision as the laser scanning delivered in the same study.For larger contiguous areas, terrain models from laser scanning and UAS photogrammetry were compared, one flat surface area and two hilly surface areas. A mean deviation of 9 mm was obtained for the flat area while the deviation ranged between 14-30 mm for the hilly areas. UAS photogrammetry assessed was 4-8 times as efficient as the conventional methods used in study. There are also disadvantages to use the UAS technology since it is weather dependent and the software used for data processing is still under development.Validerat; 20160826 (global_studentproject_submitter