World's largest panorama: London-The panorama was shot from the top of BT Tower, using 4 cameras, lenses, and robots for moving the cameras. Three photographers using about $100,000 of gear spent 5 days up there. Ultimately we used 1 set of images which was shot over 90 minutes. Stitching was done on two workstations with 192GB and 256GB of RAM, using Kolor Autopano Giga stitching software. Sadly, the software choked on the gigantic dataset, and the stitching work ended up taking about 3 months longer than planned.
Find the pig http://btlondon2012.co.uk/pano.html