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True, though having a human posted in remote locations has additional benefits, like assisting folks who are lost / injured.

Sans the drone (at least as far as my knowledge on the matter goes ,which is not very far) they already do this and the maps are freely available:

I would hope that such software is used for car alarms in order to get the false positive rate from 99.99% to perhaps 80%.

Drones are also loud, which has a cost for every false positive.