10 Mar '17, 11pm

#ImagenDeLaTierra Cultivating Egypt’s Desert https://t.co/wXyXoLz9Y8

Editor’s note: today’s caption is the answer to the March puzzler. Egypt’s Western Desert is dry, which is not surprising; it is, after all, a desert. But this part of the eastern Sahara (west of the Nile River) is so dry—receiving just centimeters of rainfall per year—that researchers describe it as “hyper-arid.” As such, it seems unlikely that much would grow there. Greenery, however, has been cropping up in the area in recent decades. On February 26, 2017, the Operational Land Imager (OLI) on Landsat 8 captured these natural-color images of East Oweinat, one of Egypt’s land reclamation projects aimed at making some desert areas suitable for agriculture. Both the wide and detailed images show the geometric forms of the cultivated land. The circles indicate the irrigation method: water pumped from underground is delivered to sprinklers that rotate around a central pivot p...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=89820&s...

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Cultivating Egypt's Desert

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