What's much more interesting, assuming you had an appropriate license how would you detect proprietary additions? "Look ma, that street corner ain't in OSM, it must be prop!" Happy searching within the number of street corners in the world.
Posted Oct 23, 2008 0:22 UTC (Thu) by corbet (editor, #1)
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Proprietary additions would probably be completely different types of data. On the list there was a discussion of a city's database of bus stops, for example.