California’s rapidily disappearing groundwater was tracked by NASA and its partners over a period of 12 years. Image credit: NASA/JPL-Caltech/University of California, Irvine
Article in EcoWatch entitled, "NASA Satellite Images Reveal Shocking Groundwater Loss in Drought-Striken California," can be read here.
Excerpt from the article, explaining the images:
“This trio of images depicts satellite observations of declining water storage in California as seen by NASA’s Gravity Recovery and Climate Experiment satellites,” says NASA. “Colors progressing from green to orange to red represent greater accumulated water loss between April 2002 and June 2014.”