Vacation pics and geotagging (blog comment)

[Archive]

[Originally posted by exiftool on 2009-05-04 15:48:31-07]

I'm back from my vacation and already have issues with the new
geotagging feature.  I sync'd my GPS and camera clock at the start
of the vacation, and 2 weeks later the camera time is now 2 minutes
and 34 seconds fast.  Arg!  I'm going to have to add a feature to correct
for errors in the camera clock rate.   (I will have to assume that the
camera clock rate is constant -- if it is temperature dependent, then
I am screwed.)

I did some aerial photography while on vacation, and the airplane can
cover quite a bit of distance in 2.5 minutes (@ about 100 mph), so I
need good clock accuracy.

- Phil

[Archive]

[Originally posted by exiftool on 2009-05-23 16:42:53-07]

I've just completed 3 weeks of testing my GPS clock vs. my camera's clock.
The camera seems to drift at a stead rate of about -2 seconds per week,
which is acceptable.

I must come to the conclusion that the 2 minute time different I
found for my vacation pics was operator error (ie. my fault).  I must
have either double corrected the images or reset the camera clock after
my first image.

So I have no need to implement a clock drift correction in exiftool.

- Phil