Equal Earth vs Robinson vs Winkel Tripel vs Web Mercator

For a world thematic map in which country or continent size contributes to the message, Equal Earth is the strongest default of these four projections. Robinson and Winkel Tripel are better candidates for a balanced general-reference world. Web Mercator is the practical choice when the map must use the dominant square tile system—but it is the weakest of the four for comparing global area.

That is a clearer answer than saying each projection has strengths and weaknesses. They do, but the strengths belong to different jobs.

Projection · Defining commitment · Best fit · Main cost

Equal Earth — Preserves relative area — Global thematic maps and area-conscious reference maps — Local shapes and directions change
Robinson — Visual compromise — Editorial or general-reference worlds with a familiar outline — Preserves no geometric property exactly
Winkel Tripel — Reduces a combination of area, direction and distance distortion — Detailed general-reference world maps — Area still is not proportional
Web Mercator — Square web tiling; Mercator-like local angular behaviour — Multi-scale slippy maps and established basemap stacks — Severe high-latitude area enlargement; poles excluded

Equal Earth: the best starting point for thematic world maps

Equal Earth was designed to preserve area while retaining a continuous, rounded world that feels less unfamiliar than many older equal-area projections. A country with twice the surface area of another receives twice the map area. That makes the visual weight of global regions more defensible for themes such as land cover, protected area, population totals or emissions.

The cost of preserving area is a change in shape: outlines stretch towards the edges and at high latitudes, and no route or pairwise distance should be assumed correct. Equal Earth also does not fit the standard Web Mercator tile pyramid, so implementation may require a projection-aware renderer, pre-rendered map or custom tile strategy.

Those are real constraints, but they do not weaken its case for a static or purpose-built global thematic view. When area matters, preserving area is more important than inheriting a rectangular basemap because it is familiar to the production stack.

Robinson: balanced appearance without an exact guarantee

Robinson was developed through an appearance-led process. Its curved meridians, straight parallels and rounded outline distribute distortion in a way many readers recognise as a conventional modern world map.

It can work well as a quiet reference backdrop or editorial illustration, but its weakness is the absence of an exactly preserved property rather than ugliness or technical inferiority. Because area, angle, distance and direction all change, Robinson's visual balance is a less defensible basis than Equal Earth's area guarantee when a thematic map invites readers to compare the footprint of countries.

Robinson remains a viable choice when recognisability and overall composition matter more than measurement, especially when the map carries sparse reference information rather than area-based data.

Winkel Tripel: the stronger general-reference candidate

Winkel Tripel is also a compromise projection. Its name refers to the combination of three distortion measures—area, direction and distance—that its construction seeks to reduce. It has become familiar through its use in major atlas and reference-map contexts.

Between Robinson and Winkel Tripel, Winkel Tripel is usually the stronger candidate for an information-rich general-reference world because it was designed to reduce a defined combination of global distortions rather than to achieve a preferred outline alone. That is still not an equal-area promise. High-latitude regions retain more mapped area than their true proportion, and local shapes change away from favourable regions.

Use it when the map's job is to help readers locate and relate many places across the world, and no single geometric property dominates the story.

Web Mercator: infrastructure first, world map second

Web Mercator became the standard coordinate space for many online basemaps because the projected world forms a square that can be divided into the same tile pattern at every zoom level. It supports efficient caching, predictable interaction and an enormous ecosystem of compatible data and styles.

Its global view is a by-product of that infrastructure, not a strong general-purpose world projection, because scale increases rapidly with latitude. At 60°, linear scale is roughly doubled under the spherical formula and mapped area is roughly four times the equatorial scale; meanwhile, the poles cannot be represented and the tiled world is normally clipped near ±85.0511°.

At city scale, that global defect may have little practical effect on the reader's task. Local angles and familiar street forms remain useful, and compatibility may outweigh the modest variation across the viewport. At world scale, however, Web Mercator gives high-latitude regions disproportionate visual weight. It should not be the automatic canvas for a global choropleth merely because the map is interactive.

The decision by map purpose

Choose Equal Earth when area carries meaning

This includes filled-country thematic maps, global land and environmental coverage, and educational maps intended to correct the habitual enlargement of high latitudes. Equal Earth is also a good default when a general world map should avoid systematic area bias and no competing requirement is stronger.

Choose Winkel Tripel for dense general reference

If readers need a legible whole-world reference with many labels, coastlines and relationships, Winkel Tripel offers a carefully moderated compromise. Robinson is a reasonable alternative when its particular visual form suits the publication and exact area is not implied.

Choose Web Mercator for its delivery system

Use it when a product depends on standard tiles, established web-map controls and smooth movement from global to street scale. Then manage the world view honestly: avoid using visible polygon area as evidence, state the projection where relevant, or introduce an equal-area overview before local exploration.

Different stages can use different projections

A coherent spatial workflow can use different coordinate spaces for different responsibilities. Source geography may remain in a well-described geographic CRS. Area can be calculated in an appropriate equal-area CRS or with a geodesic method. A publishable world overview can use Equal Earth, while a detailed interactive map uses Web Mercator tiles.

When the result is shared, keep those choices and their purposes connected. A reviewer should be able to distinguish the CRS used for analysis from the projection used for display and understand why each was selected.

A concise recommendation

If you are publishing a world map and have no stronger constraint, begin with Equal Earth for thematic data and Winkel Tripel for general reference. Treat Robinson as a viable editorial alternative, not as an equal-area substitute. Choose Web Mercator because the application genuinely needs its tile ecosystem—not because it happened to be the default when the map was created.

References

The Equal Earth map projection. Original technical paper.
PROJ: Equal Earth. Projection properties and implementation.
PROJ: Robinson. Projection documentation.
PROJ: Winkel Tripel. Projection documentation.
PROJ: Web Mercator. Formula and implementation notes for the web-oriented Mercator variant.