OpenStreetMap

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http://wiki.openstreetmap.org/wiki/Shapefiles

Shapefiles

The shapefile is a common standard for representing geospatial vector data. There are several ways of working with Openstreetmap data and shapefiles. About Shapefiles Developed and regulated by Esri as a (mostly) open specification, the shapefile format spatially describes geometries as either 'points', 'polylines', or 'polygons'.