"http://www.dpreview.com/news/2013/02/21/320-gigapixel-photo-of-London-is-the-worlds-largest-panoramic-photo" said:A 320-gigapixel image taken from top of London's BT Tower has set the world record of the largest panoramic photo. It breaks the previous record set by a 281-gigapixel electron micrograph of a zebrafish embryo taken in 2012. The London image was shot by panorama specialists 360 Cities and is made up of 48,640 individual frames. To get an idea of just how large this photograph is, BT says if it was printed at 'normal resolution' the photo would measure measure 98 x 24 metres.
The photo was taken with four Canon EOS 7D cameras and EF 400mm f/2.8L IS II USM lenses plus Extender EF 2x III teleconverters. The cameras were mounted on Rodeon VR Head ST robotic panorama heads. The team took three days to shoot the individual photos and three months to process the final image.
You can look at the record-breaking panorama image over on the BT website.
Link catre panorama: http://btlondon2012.co.uk/pano.html