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Selected Flickr
The easiest way of linking photos to locations is to combine the time-stamps from both a digital camera and GPS receiver or other location-aware device. If this data is available (over the same period of time) it’s possible to process a series of images and location tracks to stamp each image with location metadata.
Here are a few resources, papers, projects, guidelines and other geo-reference issues.
Papers
Prior work
Geo-referencing Photos
These are some commercial applications and scripts that link photographs to geographic information.
GPS track and waypoint extraction
Transferring data from GPS devices can be problematic. If this is going to work in a wider, collaborative context there is a need to make guidelines for this process. It is also really important to make sure units and timezones are correctly set up on all software, so that no translation happens as the data is converted. Exported data also tends to be messy, with mixed tracklogs and waypoints, which for us meant a lot of hand-tweaking.
Extracting EXIF data
To get a handle on the photographic data we need to look at the embedded EXIF information, which contains things like capture date, time, exposure and aperture.
Content metadata guidelines
In order to standardise the sharing of geographic information (tracklogs and waypoints) we need to think carefully about the formats used. We initially intended to use locative packets, but have ended up using GPX format alongside some custom XML for time and photo information.