FlyScan is a free application for win / osx that converts video file with .srt track, generated by DJI's Inspire1 (and Phantom series), into a sequence of geotagged jpg images.
Make sure you enabled the "video caption" option on the drone pilot application, then take a jpg snapshot.
Record video while flying over your subject.
Transfer video, srt and jpg file, rename them, and run FlyScan.