Exiftool geotag on untag pictures

Question

I will use exiftool for geotagging many pictures using a kml file. Is there any option on command line for tagging only pictures without any existing geotag? I do not find any information about it.

Answer 1

I would simply check to see if there already was a Latitude (or Longitude) by adding -if "not $GPSLatitude" to your command.

Change double quotes to single quotes if you're on Mac/Linux.

Another option would be to instead add -wm cg. That means that exiftool will not try to overwrite tags that already have data.