https://www.alamy.com/keir-starmer-and-his-wife-victoria-welcome-french-president-emmanuel-macron-and-his-wife-brigitte-to-downing-street-for-talks-on-the-second-day-of-the-image687950886.html From a picture like this, one definitly can measure the hight precisely, when one knows the hight of surrounding buildings and stuff. This can be done by perspectives.

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And there are definitly pictures of the world, to show that it is round.