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Measuring Ground Water from Space, 2002-2012

Measurements of ground water—rather than water on the surface—reveal the long-term effects of drought. These maps show ground water conditions in the U.S. compared to the long-term average from August 2002 to August 2012. (Map by Chris Poulsen, National Drought Mitigation Center, based on data from the GRACE science team.)

See the video at and learn more at http://earthobservatory.nasa.gov/Features/GRACEGroundwater/