Finding the 'invisible' millions who are not on maps

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By Sarah Treanor and Katie Prescott

"There are about two billion people in the world who don't appear on a proper map," says Ivan Gayton from the charity Humanitarian OpenStreetMap.

"It's shameful that we - as cartographers of the world - don't take enough interest to even know where they are. People are living and dying without appearing on any database."

Known as the "Wikipedia for maps", anyone can download OpenStreetMap and edit it too.

"It's an amazing situation where anyone could wreck it, anyone can add to it, but what we've ended up with is a map that is the most up-to-date in some places."

According to Mr Gayton, it is the most complete and accurate map for many parts of the world, especially in rural Africa, where underinvestment means, outside of cities, there are often blank pages where millions live.

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