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fishing vessels: http://earthobservatory.nasa.gov/Features/Malvinas/

Interesting. I'd definitely believe that for some of those clusters (particularly the inverted Y). Not sure it fits with the cluster near Peru, and definitely not the one in northeastern Colorado.

The one in NE Colorado is likely oil extraction from the Niobrara shale formation.

The street view is from 2007. If you switch to aerial view (from 2016) you'll see many identical looking installations which are likely oil wells installed during the previous 10 years.

http://archives.datapages.com/data/mountain-geologist-rmag/d... says that since 2009 some 4400 wells have gone into Weld County, CO.

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