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 hide caption

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Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley

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

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