Scientists have developed USGS, NASA, several European universities and a number of other research institutes active and matured applicability of synthetic aperture radar interference (followers), a technique based on satellite remote sensing. There are many examples, especially in the field of monitoring the volcano, landslides, and demonstrate the capabilities of this technology.
It's amazing to be able to measure the movements of a millimeter on the surface of the Earth by sending radio waves into space repeated. Since the area covered by the measures usually support one 50x50, is easy to understand the power of this tool for monitoring.
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