Everyone knows about the inverted Earth where seas become land and land becomes seas, but that’s quite boring. Last April there was an interesting question posted at the Finnish Wikipedia’s “ask anything” discussion page.
Just like the basic inverted Earth, also this hypothetical planet, which we call Aam (the English equivalent might be something like Htrae), is formed of the Earth by flipping the contour lines upside down, so that the peak of Mount Everest would become the deepest point and the Challenger Deep the highest. But the interesting thing is that the volume of the oceans (about 1.3 × 109 km3) is kept unchanged.
The question is, what is Aam’s mean sea level compared to the current sea level of the Earth. From the Earth’s hypsography diagram (above), we can see that it is approximately 4,500 meters below (or above when inverted) the Earth’s sea level. Last April I made a simple image of the map of Aam by manually editing an elevation map of the Earth in the Paint software. It’s a little rough and shows only three different levels of elevation. Now that I found an application that visually calculates changes in the sea level,Sébastien Merkel. Effect of sea level on topography. The application is in French, but you don’t really need to know any French to be able to use it. I made a better image that shows more than three elevations, this time also below Aam’s sea level. After setting the sea level to −4,500 meters, the colors of course were the opposite of what I wanted, but I changed them using the Gradient Map tool in Photoshop.
References [ + ]
|1.||↑||Sébastien Merkel. Effect of sea level on topography. The application is in French, but you don’t really need to know any French to be able to use it.|