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taggraph.jpga series of image-based graphs that visualize the user-defined content tags & the timestamps hidden in the huge flickr image collection. for instance, the 'sunset by time graph' shows about 15,000 photos tagged with the keyword 'sunset', taken within the last year. the horizontal positions represent the day of the year (left: January, right: December) & the vertical position represents the time of day the photo was taken, according to the EXIF data embedded in digital images. the deepest 'dip' in the emergent wave formed by the images is the Summer Solstice, while the slightly visible repeated echo pattern around 5-7am appears to be from people whose camera clocks are 12 hours off. []


you could compare the width of the wave at summer/winter solstices with the width at the equinoxes to get an estimate of how many people post to flickr from the southern hemisphere. it appears (since the "summer" solstice is in the middle of the year with later times, and is apparently well defined) that flickr is dominated by posts from the north (as you might have expected).

Fri 02 Sep 2005 at 2:59 AM

good comment, andrew cooke. midsummer happens around January/February on the southern hemisphere, but its 'summer solstice' (and 'dip') is not appearing on the visualizations. any explanations?

Fri 02 Sep 2005 at 11:11 AM
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