Lake Pontchartrain is a lake in Louisiana, United States. There are power transmission lines about 24.27 km (15 mi) across this lake. They are practically straight and each tower is uniform and has the same height, making these towers ideal for observing the curvature of the Earth.

They are first popularized by Soundly who presented evidence of Earth’s curvature using a series of photos and videos of the power lines in June 2017. As of now, the towers and other objects on the lake are probably the most popular Earth curvature tourism spot in the world.

The pictures and videos themselves don’t require explanation as they clearly show the curvature. But here we add perspective lines to emphasize the curvature. If the Earth is really flat, then the vanishing point should intersect the horizon line. But they are clearly above the horizon line. This shows us the dip of the horizon and proves the curvature of the Earth.

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## “But, The Towers Are Not Straight!”

There are some objections within the community of flat-Earth victims. Some say the towers are not straight.

- An unscrupulous flat-Earther on YouTube did a so-called ‘analysis’ on a different set of towers, which are not straight and cover a lot less distance. Unfortunately, he never took down his erroneous video and his YouTube video is still actively misleading innocent viewers to this day.
- Soundly did observations from both sides. If they are not straight, it will be very apparent from the pictures. But in reality, the pictures show the same curvature.
- The fact that the towers are in straight lines can be verified using Google Earth.

## “But, The Pictures are Fake!”

Anyone can do a Google search using the keywords “lake pontchartrain power lines”, and it is easy to see similar pictures taken by different people, over different time.

We took the picture from Soundly’s collection (Google Drive). We are using the picture IMG_4118.JPG. He also provides its RAW file in Canon CR2 format: IMG_4118.CR2.

There is no off the shelf software who can output a CR2 file. If someone wants to fake a CR2 file, he needs to create his own software. It is going to be a massive undertaking to fake this picture.

Soundly himself expected resistance from some unscrupulous third party who will accuse him of doing bad things. To anticipate this, he did everything live on YouTube, from taking the pictures to uploading them to the Internet.

In the end, the information is verifiable and falsifiable. Anyone is free to visit the place and verify the facts themselves.

## “The Towers Are Too Close to Each Other!”

The towers are too close to each other? That’s the telephoto compression effect. The longer the focal length of the lens, the closer the objects appear to each other. And they will also appear to be more similar in size.

Soundly took the picture using a Canon 75-300mm lens on a Canon 1300D camera. He used 300mm focal length. His camera has crop factor of 1.6×. And thus, the lens is equivalent to 480mm lens on a 35mm camera. Using these variables, it can be calculated that the horizontal field of view is about 4.3°. As a comparison, our eyes have a horizontal field of view of about 55°.

The following is a demonstration of the telephoto compression effect. As the focal length becomes longer, the objects appear more similar in size, and look more closely together. The mugs here are in the same size and are not moved during picture-taking.

In reality, the distance between towers is about 287 m (314 yd).

## “But There’s No Apparent Horizontal Curvature!”

If we can observe the curvature, why can’t we see the curvature horizontally? To get an answer to that question, let’s first calculate the horizontal distance in the picture.

According to EXIF metadata, Soundly used the 75-300mm lens on a Canon 1300D camera body. He took the picture using 300mm focal length. The camera body has 1.6× crop factor. From these values we can calculate the horizontal field of view is about 4.3°.

Assuming the distance to the horizon is 20 km (the distance to the last tower is more than 24 km), then we can calculate the horizontal distance in the photo = 20 km × sin 4.3° = ±1.5 km.

Soundly’s picture has an aspect ratio of 3:2. After cropped 1:1, then the horizontal distance in the picture is only about 1 km (0.62 mi). Obviously, it is not realistic to observe curvature on such small distance.

## “The Picture Doesn’t Show The Correct Amount of Curvature!”

We can verify this by using the Transmission Line demonstration of Walter Bislin’s Curvature App. The application simulates the curvature of the Earth using the real size of the Earth, and at the same time compares it to the hypothetical flat model.

We can observe the result of the simulation matches perfectly with all the pictures and video published by Soundly.

## Reference

- Soundly’s pictures. Google Drive Link.
- Curved Water Found – Lake Pontchartrain – Electrical Transmission Pylons – (Debunk Flat Earth) – Soundly
- Soundly Shows Flat Earthers The Curve – Flat Earth Insanity
- Flat Earth: Dr Zack can’t Pontchartrain – Sly Sparkane
- Soundly Proving the Curvature of the Earth at Lake Pontchartrain – Metabunk
- Curvature App: Transmission Line – Walter Bislin