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| Robinson projection | |
|---|---|
| Name | Robinson projection |
| Type | compromise pseudocylindrical projection |
| Introduced | 1963 |
| Creator | Arthur H. Robinson |
| Used by | National Geographic Society (1988–1998) |
| Properties | neither equal-area nor conformal; visually balanced |
Robinson projection The Robinson projection is a map projection designed to create visually appealing world maps by balancing distortions of area, shape, distance, and direction. Developed in the early 1960s by cartographer Arthur H. Robinson for thematic and educational use, it became widely known after adoption by the National Geographic Society and appeared in atlases, textbooks, and wall maps. The projection aims to present continents and oceans in a way that is familiar and aesthetically pleasing to general audiences while avoiding extreme distortions associated with some traditional projections.
Arthur H. Robinson, a professor at the University of Wisconsin–Madison and a prominent figure in modern cartography, introduced the projection as part of broader debates about cartographic representation in the postwar period. The development took place amid discussions involving institutions such as the American Geographical Society and the International Cartographic Association, where scholars sought alternatives to the Mercator projection and the Peters projection for world maps used in schools and popular media. Robinson presented his work in a series of papers and at conferences hosted by organizations including the Association of American Geographers. The National Geographic Society evaluated and later adopted Robinson's projection for world maps in 1988, replacing earlier choices and prompting widespread public exposure through magazines and educational materials. Robinson collaborated with colleagues and students influenced by cartographers like Erwin Raisz and Sven H. Holmbäck, positioning the projection within mid-20th-century cartographic reform movements.
Robinson designed the projection empirically, using tabulated values rather than a single closed-form formula. He specified x-coordinates as a function of longitude and y-coordinates as a function of latitude, using a table of coefficients for latitudinal parallels at five-degree increments. The method resembles pseudocylindrical constructions used by mapmakers associated with the U.S. Geological Survey and map designers at the National Geographic Society in the 20th century. Computational implementations typically interpolate Robinson's tabulated values with cubic splines or polynomial fits for continuous rendering, and many geographic information systems incorporate routines to reproduce Robinson's coordinate transforms consistent with standards from organizations such as the Open Geospatial Consortium. The projection uses a standard meridian and central meridian conventions familiar from projections employed by the Royal Geographical Society and other mapping authorities.
As a compromise projection, the Robinson projection is neither equal-area nor conformal: it does not preserve area like the Mollweide projection nor local angles like the Transverse Mercator projection. Instead it minimizes perceived distortion across the entire map, reducing exaggeration of high-latitude landmasses compared with the Mercator projection and avoiding the extreme polar stretching of the Gall–Peters projection. Scale varies with latitude and longitude; distortion metrics evaluated by cartographers from institutions like the International Map Industry Association show moderate areal and angular distortions that remain visually acceptable for many thematic purposes. The projection produces curved meridians and parallels spaced to give an appealing globe-like appearance, making it useful where aesthetic balance is more important than strict metric fidelity. Comparative studies by scholars from the University of Cambridge and the University of California, Berkeley have quantified its root-mean-square distortions and compared them to alternatives such as the Winkel Tripel projection and the AuthaGraph projection.
The Robinson projection found prominent use in atlases, world maps in classrooms, wall maps, and mass-market publications. The National Geographic Society used it extensively in its world maps from 1988 until the late 1990s before switching to the Winkel Tripel projection. Educational publishers, including Oxford University Press and Cambridge University Press, adopted Robinson-based maps for textbooks and instructional materials. Airlines, travel companies, and multimedia producers have employed Robinson-style world maps for route planning displays and illustrative graphics. Because the projection balances continental shapes, it is favored for thematic maps showing global phenomena—such as population distribution, climate zones, and trade routes—published by organizations like the United Nations and the World Bank where visual comprehension across broad audiences is prioritized.
Several adaptations and variants of the Robinson approach have been produced by cartographers seeking to improve mathematical properties or tailor aesthetics. Some variants replace Robinson's tabulated coefficients with analytic functions to facilitate exact computation in software packages developed by groups such as Esri and open-source projects like Proj4. Others hybridize Robinson features with elements of the Interrupted Goode Homolosine or blend with the Winkel Tripel projection to reduce specific distortions in regional maps commissioned by national mapping agencies including the Ordnance Survey and the Geological Survey of Canada. Visual designers working for publishers like Rand McNally have introduced stylistic adjustments—altering central meridian placement, aspect ratio, and parallels spacing—resulting in Robinson-like projections suited for specific print formats and interactive displays.