“The OpenStreetMap (OSM) project is well on its way to producing
a free, user-editable street-level vector map of the world.
OpenAerialMap (OAM) is similar in scope, committed to building a
free, bird’s-eye photographic map of the world. But it faces a
unique set of challenges.“The project’s browseable world map uses a JavaScript-powered
zoomable interface similar to OSM’s, and can even render OSM data
as a layer on top of its own photographic tiles…”