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OpenStreetMap (OSM) is a collaborative "Citizen Science" project to create open source editable maps. Completeness and accuracy of the data vary across different regions but generally, they are not worse than most commercial products as several studies showed. Using the geofabrik download service, it is particularly easy to extract building footprints, roads, waterways and much more as Shapefiles (.shp) for the use in ArcGIS or QGIS.

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