Sunday, April 29, 2012

NASA's Landsat satellites see Texas crop circles

ScienceDaily: Latest Science News
A water-rich polka dot pattern takes over the traditional rectangular patchwork of fields in a series of 40 years of Landsat images. In the dry Texas panhandle near the town of Dalhart, this transformation is due to center-pivot irrigation, a farming method that improves water distribution to fields. It was invented by farmer Frank Zybach in 1949.
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