Airborne laser scanning is nowadays one of the most used technologies for data collection of the shape of the Earth´s surface. Point cloud as a result of laser scanning is often used to produce high-quality digital terrain models (DTM), whose accuracy is evaluated in the analysis process.
In the thesis we discussed the influence of the geometry of laser scanning on determination of the DTM´s altitude component on two different types of grounding, meadow and asphalt, in testing area in Radovljica. Within each area we discussed two data sets, strip point clouds and georeferenced point clouds. We analyzed the impact of the height of the recording platform over the terrain, the size of angle from nadir and distance from the GNSS ground reference station on the geometry of laser scanning. The height comparison was based on check points, measured in
the field. Based on the analysis of the quality of the DTM, the results of which are the measures of statistical dispersion, and the calculated geometric parameters, the figures were plotted, and those are the main way the results are displayed. Final findings regarding the size of each effect on the quality of the determination of point positions based on airborne laser scanning are given in
the conclusion.
|
