
--gps
-g gps_data.gpx

--timeadd
-z +/-XX - time zone in which photos were taken - eg, +8.

--no-interpolation
-i - DON'T interpolate between points.
  Instead, will round to the nearest point. If halfway,
  rounds down.

--verbose
-v Show what is being written into the files.

--no-write
-n Do not write the exif data back to the files.

--datum
-d Put "datum" in the file as being the measurement datum.
    If not specified, use WGS-84.

--max-dist
-m Max distance in time in which a photo can still be matched
   to a point. Applies to both Interpolation and rounding.
   IMPLEMENT ME!

--show
-s Just show the GPS data embedded in the files on the command
   line, and do nothing else.

--machine
-o Show the GPS data embedded in the files on the command line,
   and make the output machine readable.

--remove
-r Remove GPS tags from the passed file. All GPS tags will be 
   stripped.

--ignore-tracksegs
-t Ignore track segments in GPX files: ie, if the file is split
   up into segments, interpolate between segments. Generally segments
   define when the GPS was and was not recording.
