About the date and time stamp
The most important component of linking photos to GPS position is the date and time stamp on your photos.
When you take a photo with your digital camera, your camera records the date and time the photo was captured and saves that information to the photo's original date and time tag. PhotoLinker uses this tag to sync with your GPS data.
Your GPS records dates and times with time zone information; your camera, however, does not. This means that you need to specify the time zone your digital camera's clock was set to. For example, the UTC Offset for Pacific Standard Time (PST) is -8 hours, or -0800.
- Setting the time zone
- Consider using UTC for your camera's clock: Ensuring accurate date and times on your photos
Daylight Saving Time
During the summer months this means that you need to add another hour to the UTC Offset. For example, the normal -0800 offset for PST, is really -0700, aka Pacific Daylight Time (PDT).
Camera clocks tend to drift. However, incorrectly set camera clocks can be corrected for and it is remarkably easy to achieve accuracy down to the second.
Advanced date and time tools
PhotoLinker provides a tool for adding the date and time original tag to scanned slides or prints. Additionally, PhotoLinker can copy between date and time tags including the file creation.
The different date and time tags
There are six common date and time tags in a photo's metadata, each of which has a different meaning.