Comparing Map Projections

A mashup of Map Projection Distortions and transitions using the D3.js extended geographic projections plugin.

A comparison of map projections by four different types of distortion:

• Acc. 40° 150% – The Acceptance index is a numerical measure that summarizes overall projection distortion, in this case with a maximum angular distortion of 40° and areal distortion of up to 150%.
• Scale – The weighted mean error for overall scale distortion.
• Areal – The weighted mean error for areal distortion.
• Angular – The mean angular deformation index.

Lower is better. Data transcribed from the Natural Earth Projection by @mbostock.

Read more about map projections on Wikipedia.