Werner Cordiform Projection
The Werner projection encloses the entire Earth in an ornamental, heart-shaped boundary. While it preserves the area proportions of landmasses, countries near the outer curves of the heart pay a steep price in extreme distortion and bending.
When cartography meets Renaissance geometric passion
Heart-shaped (cordiform) maps of the world were highly fashionable in the 16th century, a Renaissance era when cartography was both science and art. Developed in 1514 by Johannes Werner, the projection maps the sphere such that the North Pole lies at the center indentation of the heart's lobes, and the South Pole at the sharp point at the bottom. Mathematically, Werner created a strictly equal-area projection, which was a remarkable geometric feat for its time.
The primary advantage of this map is its preservation of areas. However, the further south and the closer to the left or right edges you look, the stronger the angular distortions become. For instance, Australia is drastically stretched and bent along the heart's curves. Because of this, the Werner projection was eventually phased out in favor of more practical designs.
Global Cartographic Grid
Distortion Properties
| Property | Characteristic |
|---|---|
| Area | ✅PreservedPreserved (equal-area projection) |
| Shape | ❌DistortedHighly distorted away from the central pole and central meridian |
| Distances | ✅PreservedPreserved along all parallels and along the central meridian |
| Angles & Directions | ❌DistortedDistorted, especially near the outer margins |
| Continuity | ✅PreservedPreserved |
History & Origin
Developed and popularized in 1514 by the German parish priest and mathematician Johannes Werner of Nuremberg. Werner refined an earlier design proposed around 1500 by the Viennese humanist Johannes Stabius (Stab). During the 16th and 17th centuries, it was widely used for world maps and maps of Asia, before eventually being replaced by newer, less distorted projections.
Applications
Today, this projection is used strictly for historical and educational purposes as a showcase of early cartographic geometry. It is occasionally used in creative visualizations due to its unique heart-shaped (cordiform) appearance.
How to read this map
Imagine a flexible, heart-shaped frame into which you press a globe — the entire land area conforms to its interior, but the continents at the margins must bend dramatically to fit into the curves.
- The North Pole is located at the top indentation of the heart, and the South Pole is at the very bottom tip.
- The central meridian (running vertically through the middle of the heart) has zero shape distortion — countries located there look natural.
- Look at countries on the outer edges (like Australia) to see extreme bending and shear distortion.
- Notice the equal-area property — the sizes of Africa and Greenland are in perfect proportion to each other.
What you gain and lose
Werner preserves area fidelity globally at the cost of extreme shape and angle distortions on regions far from the center.
Historical map displays, decorative wall graphics, and teaching about pseudoconic projections.
Marine navigation, everyday geographical work, and accurate direction measurement.
✦ How do different countries look in this projection?
Analyze shape distortions of 5 countries in this cartographic projection and test them in the sandbox.
Poland is located close to the central axis, resulting in minimal shape distortion.
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Australia lies at the bottom corner of the heart, resulting in a dramatically bent and sheared silhouette.
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Brazil lies in the lower part of the heart, showing how the South American continent curves along the parallels.
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Greenland, located near the pole (the center indentation), has the correct area but a slightly tilted shape.
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South Africa lies in the lower zone, causing its contour to stretch significantly to the sides.
Test on map →Facts worth remembering
- This projection was extremely popular in Renaissance world atlases during the 16th and 17th centuries.
- The Werner projection is a special case of the Bonne projection, where the standard parallel is at the pole.
- Cordiform maps were frequently used for religious or theological purposes due to the symbolism of the heart.
Keep reading about maps that reshape intuition
Frequently Asked Questions
The heart shape (cordiform) is a mathematical result of the pseudoconic design, where all parallels are concentric arcs of circles centered on the North Pole, and the spacing between them is constant.
Yes, it is a strictly equal-area projection. Any region on the map (like a continent) has an area directly proportional to its actual size on the globe.
Countries located in the far south or near the left and right margins of the heart (such as Australia, southern South America, and southern Africa). They undergo extreme shear distortion and bending.
Countries located along the central meridian and close to the North Pole, such as the Scandinavian countries or northern Russia. Shape distortion there is minimal.
The Werner projection is a limiting case of the Bonne projection. While the Bonne projection allows any standard parallel to be chosen, setting this standard parallel to the North Pole (90° N) yields the Werner projection.