I was developing some graph-based search algorithms and it would be interesting to use them against some real data. I used openstreetmap against them (downloaded some city-wide OML files from some obscure site), and it all worked well until I started noticing that the data wasn't that trustworthy — the data near my house had wrong highways directions, and there were roads that weren't properly connected.
I was wondering whether I could download full-city google or bing (or actually, any found to be trustworthy source) maps data for this same batch processing? What I basically need is access to all the streets (and to know whether they are one or two-way streets) of a given town of my choice (Lisbon, for instance), as a combination of vertex + edges, or any other format that will let me gather that info, for offline use.
Best Answer
When you say download, I assume you mean for free. You may be able to find something here http://gis-lab.info/qa/vmap0-eng.html which will be good enough for testing.