This is depending on the area you are editing. In the US you can use a variety of PD-licensed aerial imagery sources, in Germany there is some local and regional authorities releasing some of their imagery for OSM, and also in Italy, Spain, Australia and other parts of the world good imagery gets more and more available. Check the wiki for more information, e.g.: * - http://wiki.openstreetmap.org/wiki/Aerial_imagery * - http://wiki.openstreetmap.org/wiki/Vertical_Aerial_Photographs * - http://wiki.openstreetmap.org/wiki/Potential_Datasource

This is depending on the area you are editing. In the US you can use a variety of PD-licensed aerial imagery sources, in Germany there is some local and regional authorities releasing some of their imagery for OSM, and also in Italy, Spain, Australia and other parts of the world good imagery gets more and more available. Check the wiki for more information, e.g.: * http://wiki.openstreetmap.org/wiki/Aerial_imagery * http://wiki.openstreetmap.org/wiki/Vertical_Aerial_Photographs * http://wiki.openstreetmap.org/wiki/Potential_Datasource