Hello,
My camera uses CET time / GPS uses UTC time.
When geosyncing images I put time offset without UTC and photos are geotagged correctly, ie:
exiftool -geosync=-00:02:27 -geotag ... etc...
actual offset is -(3600 + 147s)
The question is how exiftool knows the time zone as there is no TZ information
in Date/Time Original and I cannot find any tag which explicite contains TZ, ie:
Date/Time Original : 2017:10:29 11:17:12
--tomek
Hi Tomek,
ExifTool uses the system time zone if not provided. (Read the geotime documentation here (https://exiftool.org/geotag.html#geotime).)
- Phil
Hello Phil
Thanks for explanation.
So it seems to me it would be safer to use time shift explicitly using
GPSTIME@IMGTIME
namely
-geosync=19:32:21Z@14:31:49-05:00
syntax? Just in case system time is not in sync with camera
--tomek
Sorry, I wasn't clear about the difference between -geosync and -geotime.
To be safe you should specify the time zone in the -geotime option. A -geosync time zone (if given) is only used to calculate a time difference that is applied to the -geotime value. The -geotime time zone (or system time zone if not otherwise specified) is used in calculating the absolute time for interpolating the position.
- Phil