ELI5: Explain Like I'm 5

Oblique Mercator projection

Imagine you want to turn the round Earth into a flat map so you can easily look at it and find places. This is called a "projection." But since the Earth is round and a map is flat, the map can't show the whole Earth all at once. Instead, the map will show only part of the Earth, depending on what kind of projection you choose.

Now, the oblique mercator projection is one kind of projection that shows the Earth from an angle, as if you're looking at it from a high point above one side of the globe. This means that instead of seeing the Earth straight on like in some other projections, the oblique mercator projection shows it tilted or slanted.

Why would someone want to use this kind of projection? Well, it can be helpful for maps that need to show a particular area in a lot of detail, especially if that area is close to the poles. The oblique mercator projection can also be used to show countries or regions that lie along a diagonal line across the globe, rather than straight east-west or north-south.

To make this projection, you start by picking a point on the Earth's surface that you want to be the center of your map. Then you draw a straight line from that point to the North Pole or South Pole (depending on which side of the equator you're on). This line is called the "orthodrome" and it will be the straight line that runs up and down the map.

Next, you divide the Earth's surface into a series of tiny "tiles" or "rectangles" and project each tile onto the map using a complex mathematical formula. This is how you turn the round Earth into a flat map.

The result is a map that shows the Earth from a slanted angle, with the orthodrome running straight up and down the middle. This can make it easier to see and understand the geography of a particular area, especially if you need to make detailed measurements or calculations.

So there you have it, a simple explanation of the oblique mercator projection!