We can also find pictures where the horizon line is below the center point.Because we cannot know whether the photographer bothered to correct the distortion, it is a good idea to find pictures where the horizon line is right in the middle, where the distortion is minimal. A wide-angle lens usually has barrel distortion.Find images taken from a high position using a wide-angle lens.To do the same for third party pictures on the Internet, these are various tips to get suitable images: Placing a known straight object near the horizon line as a control.Turning on the distortion correction in-camera, or fix the distortions in post-processing.Placing the horizon line at the center of the frame.Using a high-quality camera and a wide-angle lens.To control the distortion, we can do these things: The wider the lens and the higher the observer’s position, then the larger the curvature will appear, and the less possibility to be affected by lens distortions. The horizon line is visibly sharp with enough contrast, not blurred.Take the picture from a high enough location.If successful, then the remaining curvature in the photograph can only come from the curvature of the Earth. We will need to control these distortions using proper photography techniques, or by placing a known straight object as a control object in the frame, close to the horizon. Magnifying in such a way will also magnify the distortions introduced by the camera lens. However, in some cases, we can exaggerate the curve by taking photographs of the horizon and then magnifying the results vertically. The horizon appears flat because the curvature is too small when observed from near the Earth’s surface.
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