The new title of "Largest Digital Photograph" in the world now belongs to a photo of Delft, Netherlands.
The photo is actually a series of 600 pictures stitched together to create a 78,797 x 31,565 resolution photograph: 2.48 gigapixels. That 2.5 times larger than the previous record holder, a one-gigapixel photo of the Grand Canyon.
The Netherlands Organisation for Applied Scientific Research at the Electrical Engineering faculty of Delft University invented a computer-controlled pan-tilt tripod that determined the aiming points for a Nikon D1x with its 400mm lens. After the picture were taken, it took three days to stitch them together.
You can see the picture and read the technical details of producing it at GigaPix UK.