OSM worldwide coverage

General talk
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Hey, do you know some statistical data about OSM worldwide coverage for 2015… I mean how much from the World surface is covered by OSM data? thanks

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Cross-posted: https://help.openstreetmap.org/questions/48606/do-you-have-some-statistical-data-about-what-percentage-of-the-earths-surface-is-covered-by-osm-data