We went to South Carolina to view the eclipse. I took a picture of the lake, knowing my phone would add the GPS coordinates and I'd be able to figure out where I was later. 
The smooth sand in front of that tripod is where we hope to catch shadow bands. When we got back to North Carolina (the trip home was also an adventure!) I opened one of the images in the Linux file manager and was disappointed:
No interesting data. Next I tried GIMP, and was again disappointed:
I now know the answer is there, but it is labeled wrong for the Latitude. Next I tried ImageMagick, and got close, but with some odd representation:
Now I'm close, there are nicely labeled values for both Latitude and Longitude, but what do they mean?
Lat: 35/1, 10/1, 25322/1000
Lon: 82/1, 27/1, 12095/1000
If I look at windows properties, I get a fairly clear answer, but still not in a useful format.
I think different cameras may use slight variations of the idea, but the answers above are showing degrees, minutes, and seconds. Google and JMP just use degrees with a lot of fraction after the decimal. So the answer for this picture
is computed as degrees + minutes/60 + seconds/3600. For the ImageMagick representation, it looks like
Lat: 35 + 10 / 60 + (25322/1000) / 3600 = 35.173700556
Lon: 82 + 27 / 60 + (12095/1000) / 3600 = 82.453359722
You can make a google map link like this (Note the negative sign for W 82 degrees longitude, its important!):
Or, from the lake picture, you can go here:
https://www.google.com/maps/@34.7025426,-82.8332649,921m/data=!3m1!1e3
Here's the video; the shadow bands are from 2:30 to 3:30.
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