🌐 Tissot’s Indicatrix

This is a neat interactive tool to visualize distortion due to map projection using Tissot’s indicatrix, a mathematical model for calculating the amount of warp at different points:

Nicolas Auguste Tissot published his classic analysis on the distortion on maps in 1859 and 1881. The basic idea is that the intersection of any two lines on the Earth is represented on the flat map with an intersection at the same or a different angle. He proved that at almost every point on the Earth, there’s a right angle intersection...