For these reasons, three isolated earth piles (see Fig. 8) were measured
in more detail. Results are shown in Table 5. The differences in
the surveyed earth volumes for the three piles were between 8 and
16%. Since fewer points were taken with the RTS, it is assumed that
the UAV measurement provides a more accurate earth volume estimate.
However, to avoid over- and underestimating of the volumes a terrestrial
dense point cloud laser scanning approach should have been utilized to
compare the resultsmore accurately. Although such alternative surveying
methods need to be applied in future research,