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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Analysis of the influence of the calibration and strip adjustment on the geometric accuracy of UAV LIDAR point clouds
 Dvořák, Dennis ; Potůčková, Markéta (advisor) ; Dušánek, Petr (referee)
This diploma thesis solves the analysis of the influence of calibration and the method of strips alignment on the geometric accuracy of a point cloud acquired by UAV lidar scanning. The aim was to find out the influence of individual used methods, respectively various combinations. The effect of the design of the cross-flights has also been added. The evaluation was performed using standard deviations of the distances corresponding to the areas scanned in different point bands. Furthermore, verification was performed by comparing checkpoints. The results show that there is no dependence between the individual combinations. The only case was a larger displacement of the point cloud at the edge of the scanned strip in the case of cross-flights.
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Calibration parameters of the UAV laser scanning
 Dvořák, Dennis ; Potůčková, Markéta (advisor) ; Dušánek, Petr (referee)
The spatial accuracy of points obtained from aerial laser scanning is most affected by the parameters of the GNSS receiver used, the IMU unit and the parameters of the flight itself. An important role is played by the accuracy of the so-called calibration, ie the determination of the transformation elements between the coordinate systems of the scanning unit itself, the IMU and the position of the phase center of the GNSS antenna. The diploma thesis deals with the calibration accuracy of the IMU / GNSS unit. It compares the displacements and rotations of a point cloud acquired by LiDAR (laser scanner RIEGL miniVUX-1UAV) in relation to the calibration elements given by the manufacturer. Evaluate the results using calculated standard deviations and positional differences in the raw point cloud, or by comparing point clouds obtained by another method. It also focuses on verifying geometric accuracy using checkpoints. The accuracy of the IMU / GNSS calibration is minimal after verifying the results and comparing the influence of the calibration elements given by the manufacturer. There was no significant improvement in the quality of the point cloud. At the same time, it was found that for better quality of the scanned data, it is necessary to perform cross-flights when UAV scanning. Key words UAV,...
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See also: similar author names
11 DVOŘÁK, Daniel
24 DVOŘÁK, David
6 Dvořák, Dalibor
11 Dvořák, Daniel
24 Dvořák, David
10 Dvořák, Dominik
1 Dvořák, Dušan
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