Thank you Lasse for sharing this video, the experiment done here is very clever. Finding such an open area with a proper distance to buildings we can all easily research is a great experiment and a good way to settle this discussion.

Now as far as I can see this video only provides evidence of a round Earth... First of all, the buildings appear only from their "waist" and above. I mean, you can clearly see that with your own eyes at both max and medium zoom, that the horizon cuts off the lower parts of the buildings.

Much more significantly though, is that the entire Toronto Islands, with the Toronto Island Park (including some tall trees), are completely gone. Despite the fact that they are literally right between the photographer and the CN Tower and Roger’s Center (see image below).

Now how do you best explain that from a flat earth perspective? Why can’t we see the island, any of the trees, or the lower parts of the buildings?

As for the numbers she gives at the start, where she claims that the curvature should have dropped the buildings by 517 ft (158m), these are simply not applicable. Why? Because they are obtained from a formula that measures drop height based on the assumption that the Earth is a perfect sphere (it uses the Pythagoras theorem to obtain change in height based on a perfect 2 dimensional circle). Which we have known for decades that it is not. A perfect sphere would mean that you have a perfectly slick and even curvature for every single mile. But that is not the claim made by any scientists. We know the Earth is not like a perfect circle, or a smooth billiard ball. I mean, we have 7km tall mountains and 10km+ deep oceans, so of course it is not a perfect sphere. And therefore you cannot use those formulas as some places on Earth it will be different from others.

Below you can see what we at the European Space Agency have estimated the shape of the Earth to be based on data from the GOCE satellite which measures gravitation fields used, among other things, to measure the shape of the Earth. You can see it explained here by the New Scientist

Or in a video here.

As you can see yourself on the video, at different points on the Earth curvature will be different. Now, if you pause the video at 20 seconds you will see that North America is actually relatively flat. So that explains why the curvature is not as much as she thought it would be when she used a formula based on a perfect sphere.

Still I’m eager to hear how you explain why we don’t see the trees on the Toronto Islands, or the lower parts of the buildings.
Peace