Just got back from Japan, and have been doing some mapping on the Tokyo area, as well as some railway lines further afield, including Kakunodate, Matsumoto, Nagano and Mito. (the joys of tourist rail passes!)

I think Tokyo is going to be extremely difficult to map without better aerial photos - my GPS was not a happy bunny with all those tall buildings around.

The other thing is that with so many multi-layered roads, it's really difficult to see how a 2D map is going to present enough information about what's going on! Perhaps we need some partial transparency rendering hint tags?!

Those Japanese characters are hard work too! I have a massive stash of photos of signs that I need to go through, filling out the tags with kanji and hiragana, at the moment many are just English! :(