Envisat image of Earth
Media playback is unsupported on your device

Sentinel 'workhorse' ready for launch

The lead spacecraft in Europe's new multi-billion-euro Earth observation (EO) programme is built and ready to go into orbit.

Sentinel-2a's data will track everything from the growth of megacities to the variable yields of the world's most important food crops.

The European Space Agency's project manager Francois Spoto explained the purpose of the mission to our correspondent Jonathan Amos.

  • 25 Feb 2015