This image of the Aral Sea, located on the border between Kazakhstan and Uzbekistan in Central Asia was created by combining three radar scans from Sentinel-1a. Different colours represent changes between the acquisitions.
Source: Copernicus Data/ESAIncredible Images From the European Space Agency's Earth-Observing Satellite Project
The European Space Agency's Sentinel mission has completed its inaugural year. Launched on April 3, 2014, Sentinel-1a — the vanguard of a fleet of satellites being launched by the ESA — carries a so-called synthetic aperture radar that provides continuous imagery of the earth's surface no matter what the weather.