Jeffrey Martin, writing for 360Cities:
The first one, shot from the roof of the lower observatory on Tokyo Tower is the second-largest image I’ve ever made. That’s 600,000 pixels wide. Just a reminder that your mobile phone shoots photos around 3000 pixels wide. The largest possible size of an image in Photoshop is 300,000 pixels. So, this image was very difficult to assemble into a single seamless image. In fact, it has never existed as a single image file. To view it on the web, the image is cut into more than a million little “tiles” which are loaded as needed depending on your view (similar to google maps, for example)
The panorama is 600,000 pixels wide and is composed of 8,000 photos. The detail is simply amazing.