The satellites using radar to peer at earth in minute detail

Clouds cover around two-thirds of the world at any one time, preventing conventional satellites from seeing much of the planet. But now a declassified technology known as synthetic aperture radar (SAR) can be installed on satellites to "see" the Earth's surface in the dark, through the clouds (or the smoke of wildfires), to provide a constant unobscured view of our planet, and show changes on the Earth's surface in great detail. More

(Source: BBC - May 30)