Yesterday I ve mapped the "Berceau de Saint-Vincent-de-Paul" in les Landes. I have mostly used my geotagged pictures, and some Gps tracks. The french cadastre has been a good support to draw building shape and I have checked buildings names from a local board picture. This work has to be completed mostly in the private parking lot and hangar areas. I have not been in these areas and I have obviously no pictures.
Unfortunately some of my pictures were tagged with GPS Motion (Pict + Gpx). This application is great but doesn't write meta information embedded in pictures. I found the application "Prune", useful to correlate Gpx file and picture data to create pictures with Exif data. From now, I use native picture of my iPhone ... natively geotagged :-)