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The Mathare Valley, shown here in an aerial map, is one of the largest and oldest slums in Nairobi, Kenya. Residents are using hand-held GPS devices to map the area, which comprises 13 villages and is home to nearly 200,000 people.
Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley

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In Kenya, Using Tech To Put An 'Invisible' Slum On The Map

A billion people worldwide live in slums, largely invisible to city services and governments — but not to satellites. A global movement is putting mapping technology in the hands of slum dwellers to persuade governments and the residents themselves to see these shadow cities in a whole new light. NPR's Gregory Warner visits one slum in the Kenyan capital, Nairobi.
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