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Scenes From a Changing Planet - Smithsonian.com

Read More About: alaska, landsat, remote sensing

For 40 years Landsat satellites have been circling the Earth, taking pictures from roughly 440 miles above us. Each loop lasts about 99 minutes and it takes about 16 days to capture the entire planet. Which means that Landsats have been recording, in 16-day intervals, the ebb and flow of our relationship with the planet since the early 1970s.

http://blogs.smithsonianmag.com/ideas/2012/08/scenes-from-a-changing-planet/

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