Using computer vision to create and maintain map data at a street-level is something that Google has been doing for years. But what if you crowdsourced that data collection ... what if you could access the database that was created ... and what if anyone could participate.
Geo-Tagging audio is another way of augmenting reality. Audio is triggered when a listener enters a geofenced space and the experience is controlled but the physical location of the listener. While geo-locating text, images and videos has been common place on social media the locative audio is only now coming of age.