NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Farmland, Minnesota, USA. False coloured satellite image of Minnesota farm fields imaged by the Landsat satellite on September 10, 2009. Infrared sensors provide data which is colour coded. Yellows reveal regions where crops are infested, shades of red indicate crop health, black where flooding occurs, and brown where unwanted pesticides land on chemical-free crops.
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