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How tech guards the border
By Nick Kwek
10 February 2019
... The structures are up to 180ft (55m) tall and are laden with sensors at their top ...
"The cameras, due to their remote placements, were difficult to focus from far away, but now we have really high resolution, crisp images."
He goes on: "We're able to identify things that come over the fence, people that come over the fence, contraband that comes over the fence, a lot quicker and at greater distances" ...
https://www.bbc.com/news/technology-47152051