Projection lab

Spilhaus projection: interactive map

Atlas of error · liveSpilhaus ProjectionClick or tap a country to add its outline

Click a country on the map to add its outline.Tap a country on the map to add its outline.

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Spilhaus projection at a glance

Distortion class
Conformal
Graticule type
Square
Creator
Athelstan Spilhaus (based on Adams' 1925 World in a Square II projection)
Year
1979
Area
Highly distorted: the conformal projection greatly enlarges land near the edges and corners of the square (on our map especially Argentina, China, Canada, and the USA)
Shape
Preserved locally (conformal), except at the four corners of the square
Distances
Distorted across the globe; scale varies greatly between the center and the edges of the square
Angles and directions
Preserved locally (conformal), except at the four corners of the square

Add countries from the tools panel and drag them to other latitudes. The outline keeps its true shape and area on the globe, so any change in its size on the map shows this projection's distortion. Tissot's indicatrices and the area distortion map show the same effect across the whole world.