The main purpose of this graduation thesis is the comparison of heights, gathered from two completely
different procedures. First by aerial laser scanning and second by the terrain field work. We have
evaluated the quality of heights on the specific area with high vegetation. For this reason we have
decided to perform terrain work in the forest near Radovljica. Furthermore, we wanted to define the
GNSS point determination ability in a deciduous forest in the period, excluding lush vegetation. By
using combination of GNSS and classical terrestrial methods we have shown advantages of such
positioning in the areas with problematic direct GNSS signals’ reception. In this particular case we can
confirm the hypothesis, that GNSS positioning in deciduous forest is possible over the period with less
vegetation. However, we emphasize that far more studies in different locations and times over the year
should be performed to get a general assessment of the possibility of GNSS positioning in deciduous
forests. From the results of height quality evaluation we can conclude, that heights from aerial laser
scanning should be checked using different technologies, especially by terrain field work. At the same
time this is a time consuming procedure that cannot be used in all cases where lidar heights are for
wide area studies. Such a procedure of evaluation of quality of heights is used in cases, where a lower
quality of results from aerial laser scanning due to the deficiencies of the technology itself is assumed.
|
