[Digikam-users] GPS Logger

[Arnd Baecker]

On Sat, 20 Oct 2007 glechner at esi.ac.at wrote:

> > Hi Gandalf,
> >
> > some time ago I collected some links in the wiki,
> >   http://wiki.kde.org/tiki-index.php?page=Digikam+Geolocalization
>
> Thanks a lot for the links, Arnd! This DG-100 seems to be nice to me. In
> any case, it would be important for me that it is well supported under
> Linux and digikam in particular.
>
> Just to make sure what the workflow would be to synchronize my pictures
> with the GPS data:
> - Do I have to convert the NMEA log (no idea about it, but that seems to
> be what the DG-100 writes) to some other format before I can access them
> in digikam? I remember having seen something like "open GPX file" in
> digikam. Or can read digikam this NMEA format, too?

Digikam uses the gpx format. For the DG-100 the above
software generates this from the stored track
(globalsat was so kind to release the specifications after my request ;-);
however the DG-100 does not store the NMEA log (which
for example normally contains other useful information,
like the number of satellites found and the signal quality,
as far as I know).
In any case, gpsbabel is able to convert from almost any interesting
format to gpx.

> - I then open the logfile with all the GPS data and digikam will write the
> GPS tags in all pictures with corresponding times, right?

Yes.

One very important thing: the best is to have
the camera time adjusted properly to avoid fiddling around
with offsets (which is well supported the GPSync Tool).

Something which is helpful is to use `ntpdate` to
have a good time on your computer and then compare:
  date
  gphoto2 --get-config time
  date
(Sometimes gphoto2 access is instantaneous, sometimes it takes
about 7-8s, haven't been able to figure out a scheme here ...)

Setting the time in the camera (for models which support this)
can be done with
   gphoto2 --set-config time=....
((Maybe something like this should be integrated into digikam ... ;-))

> - One more question: Is it possible to automatically add tags
> corresponding to the GPS data, like "Location/Asia/Japan/Tokio/Imperial
> Palace", to the pictures? That would be a great feature saving a lot of
> tagging time.

Not yet, see this wish:
  http://bugs.kde.org/show_bug.cgi?id=150981

Best, Arnd