For centuries, the Mercator projection has dominated world maps. Its familiar rectangular shape, with its exaggerated polar regions and a Greenland that appears nearly the size of Africa, is deeply ingrained in our visual culture. Yet, its primary function—aiding maritime navigation with consistent compass bearings—comes at a severe cost: a massive distortion of area. This has perpetuated a distorted view of the world, one where the Global North appears disproportionately large compared to the tropical regions. Enter the Equal Earth projection, a modern cartographic solution designed with fairness and accuracy at its core.
What is the Equal Earth Projection?
The Equal Earth projection is an equal-area pseudocylindrical map projection. In simpler terms, it is a method for representing the curved surface of the Earth on a flat map where the relative area of any region is preserved accurately. If a country takes up 5% of the Earth's landmass, it will appear as 5% of the map's land area. This stands in stark contrast to the Mercator projection, where areas near the poles are stretched to enormous, unrealistic proportions.
Introduced in 2018 by Bojan Šavrič, Tom Patterson, and Bernhard Jenny, the Equal Earth projection was explicitly created as a visually pleasing and politically neutral alternative. Its designers sought to combine the mathematical rigor of an equal-area projection with the aesthetic appeal of more familiar, rounded-out projections like the Robinson projection. The result is a map that looks natural and "Earth-like" while being mathematically fair.
Why Was a New Projection Needed? The Problem with Distortion
The issue with common world maps goes beyond trivia. Visual representations of the world shape perception. A map that makes Europe and North America look vast and dominant, while shrinking the continents of Africa, South America, and Asia, can subconsciously reinforce geopolitical and cultural biases. This phenomenon is sometimes referred to as the "Mercator bias" or "cartographic imperialism."
The Equal Earth projection directly addresses this. By ensuring equal area, it provides a more honest foundation for:
- Education: Students learning geography see a more accurate representation of the relative sizes of continents and countries.
- Global Understanding: Comparisons of population density, resource distribution, or economic data become visually valid.
- Fairness: It offers a counter-narrative to maps that inadvertently center and enlarge former colonial powers.
Key Characteristics and Advantages
The Equal Earth projection is not just a mathematical exercise; it's designed for practical use. Its key features include:
- Equal-Area Integrity: This is its non-negotiable primary feature. Area relationships are 100% accurate, making it ideal for thematic maps showing distributions like population, vegetation, or climate zones.
- Pleasing Aesthetics: Unlike some equal-area projections that appear highly rectangular or compressed, the Equal Earth projection has a gentle, curved boundary. Its shape resembles a horizontal ellipse, similar to the Winkel Tripel or Robinson projections, making it more intuitive for a general audience.
- Low Distortion: While all flat maps must introduce some distortion (a fundamental rule of cartography), the Equal Earth projection maintains relatively low angular and shape distortion across most of the map. Continents retain their recognizable shapes without excessive stretching or squashing.
- Smooth, Continuous Graticule: The lines of latitude and longitude (the graticule) are evenly spaced and parallel, contributing to a clean, readable appearance.
How Does It Compare to Other Popular Projections?
- vs. Mercator: The difference is fundamental. Mercator is conformal (preserves local angles) but severely distorts area. Equal Earth is equal-area but distorts shapes, especially at the extreme east and west edges. For navigation, Mercator is still king. For a fair global overview, Equal Earth is superior.
- vs. Robinson: The Robinson projection is a popular "compromise" projection—it doesn't preserve area or angles perfectly but looks aesthetically balanced. However, it is not equal-area. The Equal Earth projection offers the visual familiarity of Robinson's gentle shape but with the crucial mathematical guarantee of area preservation.
- vs. Gall-Peters: The Gall-Peters projection is another famous equal-area projection. However, its shape is a tall, narrow rectangle, which many find visually unappealing and which heavily distorts the shapes of regions, especially near the poles. The Equal Earth projection achieves the same area accuracy in a much more visually attractive package.
Practical Applications and Availability
The Equal Earth projection is open-source and freely available, which has fueled its rapid adoption. You will find it used in:
- Infographics and Journalism: Media outlets like the BBC and National Geographic have used it for online stories to provide accurate visual context for global data.
- Academic Research: It is a preferred choice for researchers mapping worldwide phenomena from biodiversity to economic activity.
- Education: It is increasingly featured in modern textbooks and digital educational materials as a "better" world map.
- Digital Mapping: It is available as an option in major geographic information systems (GIS) software and online mapping platforms.
Limitations and Considerations
No projection is perfect. The Equal Earth projection's main trade-off occurs at its outer edges. To maintain equal area and a pleasing shape, there is noticeable shape distortion along the eastern and western margins of the map. For example, parts of Antarctica or far-eastern Siberia may appear somewhat stretched. This is a minor issue for a general-purpose world map but is a consideration for detailed regional mapping at the map's periphery. It is also not suitable for navigation, as it is not conformal.
Conclusion: A Step Toward a More Accurate Worldview
The Equal Earth projection represents more than just a technical achievement in cartography. It is a conscious effort to correct a long-standing visual bias. By choosing an equal-area map, we opt for a representation of the world that prioritizes proportional accuracy over navigational utility or historical habit. It reminds us that the map is not the territory, and the way we draw that territory matters. While the Mercator projection will always have its place for sailors, for understanding our planet as a whole—the relative sizes of its peoples, forests, deserts, and nations—the Equal Earth projection offers one of the fairest and most attractive views available today.