Anonymising GPS Data

[Wayne Kiely]

Hi all.
Great tool Phil!
I've been using the program, mostly with batch files, to extract tracklogs & other meatdata from hundreds of iPhone images for the last couple of years.
One of the participants in an open-source project I am working on has requested that we do not publish data which might identify their property. As such I'd like to apply a fixed offset to their GPS data so as to de-identiy them, but preserve their property layout.
Is there a simple way to do this and get the adjusted GPS coordinates back into images taken on their propery?
I've scanned many pages of documents to no avail & looked in the forum & the closest I could find was a thread from alfric (https://exiftool.org/forum/index.php?topic=12232.0). Should I follow this approach or am I missing something obvious.
Regards,
Wayne

[StarGeek]

GPS coordinates can simply be incremented/decremented as mentioned under the -TAG[+-^]=[VALUE] option.
Example:

C:\>exiftool -G1 -a -s -gps* y:\!temp\Test4.jpg 
[GPS]           GPSVersionID                    : 2.3.0.0
[GPS]           GPSLatitude                     : 10 deg 0' 0.00"
[GPS]           GPSLongitude                    : 10 deg 0' 0.00"
[Composite]     GPSPosition                     : 10 deg 0' 0.00", 10 deg 0' 0.00"

C:\>exiftool -P -overwrite_original -GPSLatitude+=5 -GPSLongitude+=-5 y:\!temp\Test4.jpg 
    1 image files updated

C:\>exiftool -G1 -a -s -gps* y:\!temp\Test4.jpg 
[GPS]           GPSVersionID                    : 2.3.0.0
[GPS]           GPSLatitude                     : 15 deg 0' 0.00"
[GPS]           GPSLongitude                    : 5 deg 0' 0.00"
[Composite]     GPSPosition                     : 15 deg 0' 0.00", 5 deg 0' 0.00"

[Wayne Kiely]

Thanks StarGeek.
So it was the last option I mentioned - missing something obvious!
Regards,
W

[Sarmad Nadeem]

Hi Wayne,

Try AnyEXIF tool and thank me later :)

But don't beat me if you've windows since it works only on macOS :")