Användning av UAV för datainsamling för 3D-modeller : Undersökning av flyg- och fotograferingsparametrar för UAV

Sammanfattning: In this thesis, 12 aerial photographs flights were taken over a small building in the municipality of Trosa, with a drone, or the correct name in this case is UAV (Unmanned Aerial Vehicle). Where the purpose was to create 3D models from the aerial images. UAV by model DJI Mavic Pro was used and controlled with smartphone apps like DroneDeploy and Pix4Dmapper. Different values ​​for flight and shooting parameters were tested to see how it affects the quality of the 3D model. The flight and photographing parameters that were investigated were the UAV's flight speed, flight altitude and overlap between the images. Each parameter was given a low and a high accuracy value based on what is recommended. Which results in that flight height was the parameter that had a decisive influence on the model's pixel resolution and pixel density. The resolution for a 3D model with a flying height of 25 meters was 0,828 cm / pixel. While overlap did not give a marginal difference in the model's pixel resolution and pixel density. However, there were clear differences between models with low and high overlap. The flightspeed could not be properly investigated as changes to the flightspeed of DroneDeploy did not match the flightspeed in reality.   Smartphone apps, DroneDeploy and Pix4Dcapture that handle the UAV in autonomous data collection, compared where flights with similar values ​​where used for flight and shooting parameters. Three flights were made in each app where all parameters had a low, recommended and high accuracy value. The model’s pixel resolution and pixel density were equivalent between the apps, so a questionnaire survey was conducted where the models with high accuracy were compared. Which results in that all preferred the model created with aerial photos from Pix4Dcapture where it was described as better structure and higher detail.   Two different software programs, Agisoft Photoscan and Pix4Dmapper that manage aerial images to create 3D models was compared to each other. Images from flights with DroneDeploy were used where all parameters had a low, recommended and high accuracy value. Which results in 3 models for each software. All models from Pix4Dmapper had a much higher pixel density. A model from each software with aerial images with high accuracy was compared in a questionnaire. There, all preferred the model created in Pix4Dmaps and described as being more accurate angle, size and clearer windows as well as keeping the original structure better.