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OpenStreetMap is built by a community of mappers that contribute and maintain data about roads, trails, cafes, railway stations, and much more, all over the world.

OpenStreetMap is a free, editable map of the world that anyone can add to, sometimes described as the Wikipedia of maps.

The community of people online ranges from professional cartographers to anyone that wants to help.Openstreetmaps

Those mapping, who co-ordinate and help each other, break the imagery into “tiles” and literally trace roads, buildings and highways onto the map.

The work of new mappers is validated by more experienced mappers to ensure accuracy. Just like a wiki.

Here is the resource http://www.openstreetmap.org/about

Saira Asher  from the BBC has written on how How ‘crisis mapping’ is helping relief efforts in Nepal using OpenStreetMap.

Geography teachers check the tool and the other resources provided by  Seth Dixon who curates  http://geographyeducation.org/