# OpenStreetMap Data Sources

The primary source of OpenStreetMap data is http://planet.openstreetmap.org. This has the history of planetary-level data sets, but these are extremely large files (36+ GB). Note that YAAC cannot import OSM changeset delta files, only complete data files.

There is a web page of alternate sources on the OpenStreetMap wiki at http://wiki.openstreetmap.org/wiki/Planet.osm#Downloading, for various subdivisions of the planetary data sets.