Filming has kicked off in Australia's capital city, Brisbane. By the looks of thing they have transformed a bit of the city into NYC and Chris Hemsworth and Tom Hiddleston were on set filming scenes for the upcoming film. They also took a bit of time out of their schedule to take pictures with fans as well. So obviously this film will partially take place on earth. Why Thor and Loki are on Earth at this time remains to be seen. Maybe this will explain how they come into contact with Bruce Banner/Hulk.
Thor: Ragnarok opens in theaters November 3, 2017