Infrared film can pick up data from the invisible section of the electromagnetic spectrum known as the near infrared (NIR) wavelength. Light reflected from vegetation possesses a very unique response in the NIR wavelength as infrared imagery is integral in analyzing anything that has to do with vegetation. The map above depicts water contamination in Australia, but aside of the use for this map, you can clearly see how the trees "jump out" with the response that vegetation has in infrared.
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