To back this up, when I was making maps of the rural area where I live in Japan, there were a few places where aerial maps were obscured by trees and where GPS

To back this up, when I was making maps of the rural area where I live in Japan, there were a few places where aerial maps were obscured by trees and where GPS measurements were wildly inaccurate due to geographical features. So I just guessed where the road was. It's in there somewhere and if you are driving your car or riding your bike, it's more than good enough. If you needed to know the precise location of that road for another purpose? Totally useless. Maybe someone has gone in and improved my initial efforts, maybe not (although, I was looking at it the other day and I'm pretty sure they have).