Actually, as of yesterday, there is an approved source from DG. http://wiki.openstreetmap.org/wiki/DigitalGlobe http://wiki.openstreetmap.org/wiki/DigitalGlobe

Actually, as of yesterday, there is an approved source from DG. http://wiki.openstreetmap.org/wiki/DigitalGlobe http://wiki.openstreetmap.org/wiki/DigitalGlobe The actual issue for tracing paths is that they're hard to distinguish, even from hi-res aerial imagery; a bit of ground knowledge of the area helps a lot, so that you don't map nonexistent paths which are actually fences or such.