Actually, this is Photosynth (rather both use th same base tech.) In fact, city-wide synthing has been possible for some time now- the crux is matching up the p

Actually, this is Photosynth (rather both use th same base tech.) In fact, city-wide synthing has been possible for some time now- the crux is matching up the photos fast enough, which has now been reduced to a day (for 1M photos). For the interested, fast (real-time) matching of video streams was also demoed at TechFest some year or so ago. I'm pretty sure there's a video about it somewhere, possibly at TechCrunch.