In March 2012 I wrote a blog titled, GPS Information in photos. In it I describe how to extract and resolve Exif GPS data to a map reference. Recently I wrote an update to that blog that included how to clear metadata from an image. Essentially, the two methods I would use are:
(1) Using ImageMagick with
convert gps.jpg -strip stripped.jpg
This appears to re-compress the JPEG image which may not be what you want.
(2) So, there is an alternative tool such as the exiv2 utility.
I've not used this myself, but it seems to have great command line options.
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