Mystery drone swarms over in the United States

Area survey/Multi-spectral analysis. Each drone has one or two sensors and the data are correlated in-situe or later. Drones follow a pattern or have some degree of freedom to converge faster to the distribution of target data.
 
A swarm can be half a dozen of drones only. Each one having 4 to 8 engines spinning at high speed makes for a lot of noise that could multiply their perceived number in the dark.
Multi-spectral only need any spectrum per definition. That it be light, IR, UV, radioactive, reflexion of any impeged signal etc... ;)
 
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Phillips County Sheriff Thomas Elliot had no answer for where the drones come from or who they belong to, but he has a rough grasp on their flying habits. "They've been doing a grid search, a grid pattern," he told the Denver Post. "They fly one square and then they fly another square."

 
Looks like it’s being portrayed as a hoax of some kind now.
 

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