Tracing France administrative boundaries is a tedious work that took several years as France has 36000+ municipalities which is around 40% of all Europe municipalities !
In 2011, then in mid-2013, IGN (french geographic national authority) published 2 datasets in opendata, GEOFLA and Route500, but these data are simplified with a much lower level of details compared to OSM goals. So, the only authorized and good enough source for that job is the french cadastre. As we're getting close to 100% completeness of french administrative boundaries, it is time to study their quality. Without freely available reference data, an exhaustive study is not possible, but let's try with what we have. GEOFLA and Route500 contain simplified administrative boundaries, but it seems that the crossing nodes have been more or less maintained very close to their original location. So I've tried to do some comparison on these crossing nodes between OSM and Route500 (less simplified that GEOFLA). More to read (fancy postgis queries) and see (shiny colored overlays) on http://openstreetmap.fr/node/18532 -- Christian Quest - OpenStreetMap France Un nouveau serveur pour OSM... http://donate.osm.org/server2013/
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