Trail navigation

This drones are very popular this days. A watch a lot of videos and i must say that i am impressed. I am really thinking of buying one to try my self.
 
The technique/technology is interesting, but I have to think trying to navigate individual trails would be far slower than flying at tree-top level looking down with an IR camera for initial searches. What happens if someone fell off the edge of a trail and slid down a hill? This thing would fly right by them and never notice.
 

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