You can get a glimpse of the idea around the 2 minutes 14 seconds mark back in Noah Snavely’s video from his original Photo Tourism project which inspired Photosynth.
Geoalignment is also mentioned in these two Photosynth blog posts (although not in very much detail).
Their user interface was much more polished but it’s very much the same idea as what Noah shows.
Alas, I am currently without a smartphone.
Also, I have a lot of photos taken over the last 8+ years which have no GPS track recorded.
It is primarily uploading them that I am thinking of.