The largest occurring step counts were rounded up and chosen for the whole data set. After detection, the ROIs were tracked separately in the RGB and NIR video streams. For that purpose, we also applied level set segmentation where the process for a frame was initialized by the ROI of the...
The AGL was maintained at the same level in every flight plan, so as to achieve a high Ground Sampling Distance (GSD). Finally, the flight height was set to 15 m AGL (5.76/pixel GSD) and remained constant in every later accomplished flight plan. The first flight survey was conducted on...