Reduce GPS Precision

[edent]

I have some photos which contain my precise GPS location. I'd like to reduce the accuracy of the location in the images.

Effectively, I want to go from 51.123456,0.987654 to 51.12,0.98

From reading the forum, I see I can use exiftool -gpslatitude+=1 -gpslongitude+=-2.5 file.jpg to adjust the co-ordinates. But I can't seem to find a way to have fewer decimal places. 

I could use -GPSLongitudeRef=E -GPSLongitude=0.98 -GPSLatitudeRef=N -GPSLatitude=51.12 - but I'd have to calculate that manually for each photo.

If I use exiftool -c "%.2f degrees" file.jpg, I get back the precision I want - but I don't know how to take that value and write it back to the file.

Any help would be greatly appreciated.

I'm using exiftool 11.88-1 on Ubuntu.

[StarGeek]

Try this
exiftool -c "%.2f" -TagsFromFile @ -GPSLatitude -GPSLongitude file.jpg

This sets the coordinate format to two decimal places as you discovered and copies the new values back into GPSLatitude/GPSLongitude.  The word "degrees" isn't needed for this copy operation.

Example output:

Code Select Expand

C:\>exiftool -g1 -a -s -gpsl*# y:\!temp\Test4.jpg
---- GPS ----
GPSLatitudeRef                  : N
GPSLatitude                     : 40.6892
GPSLongitudeRef                 : W
GPSLongitude                    : 74.0445
---- Composite ----
GPSLatitude                     : 40.6892
GPSLongitude                    : -74.0445

C:\>exiftool -P -overwrite_original -c "%.2f" -TagsFromFile @ -GPSL* y:\!temp\Test4.jpg
    1 image files updated

C:\>exiftool -g1 -a -s -gpsl*# y:\!temp\Test4.jpg
---- GPS ----
GPSLatitudeRef                  : N
GPSLatitude                     : 40.69
GPSLongitudeRef                 : W
GPSLongitude                    : 74.04
---- Composite ----
GPSLatitude                     : 40.69
GPSLongitude                    : -74.04

[edent]

Brilliant! Thanks mate.