The Gigapixel ArtZoom website depicts this effort by Microsoft Research, where the ‘sweet spot’ happened to be the rooftop of a condominium in downtown Seattle. Pictures for the overall panorama were taken from October 2013 onward, using a Canon digital SLR camera which had a professional 400mm lens. Apart from that, a Gigapan robotic tripod head was also used in this effort.
Other than that, extra photos were also shot from the same location, although these were planned in such a way where they targeted specific subjects, including a number of artists and performers who happen to work in the Seattle area. Should you zoom into a specific location in the panorama website, there might be a pop up message that shows up in the corner that delivers additional information on a specific artist.