A camera attached to a cell phone mast in the middle of a forest, rotating automatically and capturing over 100 images every six seconds. It monitors changes in movement, brightness and structures to detect smoke, and registers the first indications of a forest fire.
https://p.dw.com/p/19DKQ
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The German-made surveillance system was designed to reduce the time needed to extinguish major fires, and has proved a major export success.