This submission is of commercial nature but can be interesting for the very high spatial resolution invoved.
Stefan Knecht writes
"a little bit of shameless self-promotion announcing United Maps that deploy algorithms to automatically match and merge line vector sets with a precision of 95% correct matches. The goal is to produce hyperlocal vector maps on large scales up to 1:2'000 and sell them in B2B markets. Technically, geometries and attributes of primary datasets from Navteq or Tele Atlas are completed and enriched with original content from secondary data sources and professional cartographic editors.
Density of streets, pathes and trails is enhanced for up to 300% in rural and up to 50% in metropolitan areas and vector map products remain fully navigable.
A comprehensive dataset covering Germany on a nationwide and hyperlocal scale of 1:2'000 is ready now. Besides missing streets and squares, public buildings, building footprints from cadasteral sources and exact point addresses are included. Public mass transport is integrated and thousands of touristic, cultural POIs have been added. See a full feature set here.
Tell us what you think — feedback warmly welcome."