On 22/02/2010 09:04, Liz wrote: > On Mon, 22 Feb 2010, Jochen Plumeyer wrote: >> In our case of photo geo tagging this is no issue I think. >> Please tell me if I'm wrong here. >> > For photo geo-tagging the main problem is that you can set the camera time to > a resolution of one minute, not one second, and the camera time will drift, > probably inversely related to the purchase price. > > So some form of fiddling is needed to accurately place the photos, trying a > few secs forward and back until they line up on the map with known features. > So whether your GPS is UTC or GPS time is not a practical problem.
The easy option is to take a photo of your GPS device with it displaying the time. You can then adjust the time offset from that. I suppose there might be a bit of lag between the GPS device receiving/calculating the time, and displaying it on screen, plus lag in the time taken for the camera to save the photo, which might be a few seconds. Though it shouldn't make a lot of difference in accuracy, unless you are taking photos while driving past at 50mph. Craig _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
