Examining the geometry of Tyholt Tower using UAV, laser scanning and total station measurements
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Nowadays, unmanned aerial vehicles are getting more and more popular, they are not used only in aspects like military, but can be find in many civilian situation. In land surveying drones has been mostly found in monitoring hazardous areas and general mapping where application of traditional manned aerial photogrammetry is unprofitable due to range of the project. For this thesis author tried to check UAV possibilities in inventory of construction. A high construction called Tyholt tower were chosen to be the object of interest. This tower is a landmark in Trondheim, Norway. The task was divided into two parts: the cylinder and the main gallery of the tower. Examination of the cylinder showed that the land surveying methods: double-edged and laser scanning give very similar results of the inclination of the tower. However, point cloud obtained from unmanned aerial photogrammetry does not meet any similar results. The comparison of both: laser scanner and UAV s point cloud to theoretical model presented that the second dataset is characterized by lower accuracy and larger noises around the object. Studying the main gallery showed better density and comparable quality of point cloud obtained from drone rather than laser scanner. The performance of UAV in the upper area of the tower might have been caused by numerous tie pointes measured with total station letting the gallery to keep its proper shape. The thesis proves that application of unmanned aerial vehicles and photogrammetry may be very helpful for examination of high construction, as well as help in 3d modelling.