High Altitude Photographs

There are many images taken from various altitudes that purport to show curvature.

Planes and Buildings and Beaches
Many claim to have observed curvature from just standing on the beach and looking at the horizon, or looking out from the top of a tall building or mountain, or from looking out of a plane window. In all these cases it is simply not true that curvature could be seen, even according to Round Earth Theory.

What is seen, is mere optical illusion, no doubt brought on by firm belief in supposed curvature.

Planes typically cruise at 35,000 feet. At this altitude, according to RET, to stand even a chance of seeing a hint of curvature you would need a wide field of view and a completely crisp and cloudless horizon. Instead, while the latter is possible if incredibly unlikely because of a whole range of factors, the former simply does not happen. Airplane windows are famously small, and there is no way to see close to enough.

Observations from buildings and beaches, as such, have no hope of observing curvature, even if there were any to see. The best that could be ascertained is the local geography of the area; one might as well conclude that the Earth is concave because they happen to live at the bottom of a hill.

Amateur Rockets
There are images from amateurs who attached cameras to rockets and sent them up to especially high altitudes in order to view curvature. Many seem to succeed.

However, many such images rely on a 'fisheye lens,' a type of camera lens designed to take in a particularly wide angle, necessary to take in as much of the view as possible. These distort the image; if possible, always go to the view of the take-off. Often such lenses record exorbitant amounts of curvature at even ground level.

Such images are not scientific experiments, and are not intended to be. They are not taken to be proof, but because the amateur wants to see the view. If something is not intended as evidence for RET then it has rarely acknowledged the factors that could get in the way of an accurate experimental result.