They are shot with a dSLR and a very long lens. This one was likely shot with a 300mm lens. The camera is mounted on a programmable robot, and a mosaic of photos is created. They are then stitched together with software such as PTGui or kolor Autopano Giga. I've shot a number of images like this, in fact some of them over 4x bigger than this one. My largest one, of Prague, was released 2 weeks ago: http://360gigapixels.com/prague_gigapixel_panorama_900K_2018....

you can see more about my gigapixel images here: http://www.jeffrey-martin.com/gigapixel-photography

Prague link fix: http://360gigapixels.com/prague_gigapixel_panorama_900K_2018...

How long it takes for robot to take all the pictures and how many pictures there is?

Prague was 3 hours per dataset. I was there for 3 days in the cold and rain, shooting multiple datasets, from 8am to 4pm last year in November.

Wonderful pictures. The 360 views really help capture the feel of the city. Wish there was a way to fix the black hole at the bottom, though.

Sure there is, you can paste a satellite photo of the ground where you shot the photo from ;-)

Thank you for the amazing works.

There is a type in the copyright footer on your website, it states (c) 1066 - 2019

I was around since the Battle of Hastings actually, so it's not a typo.

Thank you for noticing ;)