Original file sources are jpeg from smartphone or digital camera. The GPS coordinates are correct on all source files. Coordinates are converted to a decimal number via a PHP script and then added into Google maps to confirm.
Copy original source files and check GPS coordinates again. All correct.
Open source file in PS, make adjustment and do a save or a save as. GPS coordinates change to an invalid number.
Example
Original Source File GPS Coordinates
GPS Latitude
0: 40/1
1: 43/1
2: 3383/100
GPS Longitude
0: 73/1
1: 59/1
2: 5028/100
Latitude and Longitude
40.726063888889 -73.9973
After doing a Save or Save As from PS after Image Size
GPS Latitude
0: 1/1050
1: 0/40
2: 1/4356
GPS Longitude
0: 100/0
1: 1/73
2: 1/5984
Latitude and Longitude
1.0000027777778 -100.01666944444