Mr Go reckons that urbanisation could be as low as 25%, based on data from the Global Rural Urban Mapping Project, a global population map.

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Researchers at the University of Vermont sifted through more than 10 million geotagged tweets from 2011 to map out the moods of Americans in urban areas.

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To a comprehensive terrain map of Alaska he adds data on avian flyways, urban settlements, hospital locations and climate.

FORBES: Map Mania

Elsewhere, mixed-use "lifestyle centers, " a creation of outdoor urban villages that mix retail theater and condos, are lining the map more and more.

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