Reprising a topic which I brought up in 2006, it seems that Google’s mapping team still needs to get its act together when it comes to covering Japan. Their map data is nearly a year out of date, while Yahoo seems to update its maps almost in real time.
I’ll focus on Tokyo area airports in this post, since they are one of my primary target areas of geekery. Here is Google’s map of the area surrounding Narita Airport rapid access line, which opened last summer:
Note that the line doesn’t show up at all (though its timetable data is loaded into the transit directions engine, and the route will be vaguely highlighted if you search for it). On the other hand, Yahoo is completely up to date:
Now here is Google’s map of Haneda Airport, where a new international terminal opened back in October. Of course, they haven’t gotten around to updating yet, though they at least managed to include an icon showing one (but not both) of the new international terminal’s railway stations.
Yahoo again is totally up to date, showing the full terminal building, the surrounding tarmac AND both stations (zoom in to see them).
So what gives? Both services are apparently getting map data from the same company (Zenrin) so you would think their maps would have almost identical content. One possibility, corroborated by the copyright legends at the bottom of the maps, is that Google is relying totally on Zenrin while Yahoo makes its own updates pending full updates from Zenrin. Another possibility is that Google simply doesn’t demand updates from Zenrin as often because their Maps team is based outside Japan and has no clue how much construction goes on here.