Radar satellite service checks stability of Africa's largest artificial hole

International engineering firm AMEC is working with ESA to improve monitoring of ground subsidence linked to mining activity. Radar satellites in orbit 800 kilometres away can reveal millimetre-scale elevation shifts across wide areas of land.

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<p><a href="http://www.physorg.com/news9527.html">Radar satellite service checks stability of Africa's largest artificial hole</a></p> <p>International engineering firm AMEC is working with ESA to improve monitoring of ground subsidence linked to mining activity. Radar satellites in orbit 800 kilometres away can reveal millimetre-scale elevation shifts across wide areas of land.</p>