One of Australia’s most recognisable landmarks – the Sydney Harbour Bridge – recently celebrated its 75th anniversary. To commemorate the event, authorities closed the bridge to traffic, allowing Sydneysiders to walk across. Over 200,000 did so, and now the University of Sydney’s Department of Statistics has published some great research on the event.
In fact, the research is so revolutionary, that it may have opened up a completely new genre in relation to how we officially record the scale of events. The University was able to estimate the quantity of digital images capturing the Sydney Harbour Bridge 75th anniversary celebrations.
University volunteers, stationed at the southern end of the bridge over the duration of the event, randomly surveyed walkers as they made their way off the bridge. They asked two simple questions:
- Did you use a digital camera on your walk across the bridge today?
- If yes, can we please have a look at your camera?
The researcher then checked the camera, noted down its megapixel resolution, and asked the subject how many photos were taken while walking across, and at what resolution the camera was set during this time.
Based on the sample taken, University researchers calculated that 20,000 digital cameras were in operation during the bridge walk, with an average resolution 4.9 megapixels. An average of 23.3 photos were taken and, based on the breakdown of camera picture settings, statisticians worked out that the average file size per digital photo was 388.1KB.
University of Sydney’s Department of Statistics then crunched the numbers to come up with an official estimate of the size of the event based on the digital photography:
388.1 x 23.3 x 20,000 = 180,854,600KB, or 172.5 gigabytes
The Department of Statistic’s spokesperson, Roger Rumford, did point out that this was only the first attempt to measure the scale of an event based on digital photography. “It was a fun exercise, and a really different way to look at the size of our big events in history. What we haven’t taken into account in our research include mobile cameras phones, digital video cameras and professional photographers taking pictures from other vantage points around the bridge.”
The University has also offered a new acronym for this measure of an event’s size – the Digital Photography Scale, or “DPS”.
So what was the DPS of the Sydney Harbour Bridge 75th Anniversary? 172.5 of course!