Landing the UAV after the second successful survey
Looking at the aerial image of the take-off and landing area you can see it is surrounded by large boulders. But even smaller rocks can damage the UAV during landing, and apart form the proximity of the truck the area was full of rocks of every size. While normally the autopilot does a pretty good job at landing this time a little direct control was needed just to get the final approach accurate and miss that rock in the middle.
Source: SAFER Blog