Figure 9
The figure illustrates various drone landing and drop-off methods, divided into two main categories labeled “Landing” and “Drop-off”. The layout consists of five adjacent rectangular panels arranged horizontally, each depicting a different drone delivery scenario. The first three panels fall under the heading “Landing”. The first panel on the left shows a drone hovering slightly above the ground with a parcel attached beneath it, labeled “On ground”. The background shows a simple grassy surface. The second panel depicts a drone positioned on top of a flat rooftop structure with its parcel placed directly below it. This panel is labeled “On rooftops”. The third panel under the same “Landing” category shows a drone delivering a parcel to a balcony. The drone is positioned close to the balcony railing, with a window frame faintly shown in the background. This panel is labeled “On balconies”. The remaining two panels are categorized under “Drop-off”. The fourth panel, labeled “By cable”, illustrates a drone hovering in the air while lowering a parcel using a vertical cable to the ground. The fifth and final panel, labeled “By parachute”, depicts a drone releasing a parcel attached to an open parachute, allowing it to descend gently to the delivery point below. The caption below the figure reads “Source(s): Created by authors”.Drone landing and drop-off methods