Airy’s Minimum Error

Airy’s Minimum Error

This example shows the Airy projection, a minimum-error map projection, centered over the Atlantic with a 90° clip angle. The visualization combines a graticule, landmasses from TopoJSON world data, and country boundaries rendered as SVG paths. The code uses `d3.geo.airy`, `d3.geo.path`, and `d3.geo.graticule` from D3 v3 and the extended geographic projection plugin, with land and boundary features generated via `topojson.feature` and `topojson.mesh`.

93% match

Cylindrical Equal-Area

This example shows a world map rendered using the cylindrical equal-area projection, with dark landmasses and light country boundaries overlaid on a graticule. The projection’s shape is modified by selecting different standard parallels, such as Gall–Peters or Hobo–Dyer, highlighting how the choice affects the map’s proportions. The visualization uses `d3.geoCylindricalEqualArea` and `d3.geoPath` from the `d3-geo-projection` library to draw the paths, while geodata is loaded as TopoJSON from a GitHub-hosted file. The SVG output is styled with CSS classes for the graticule, land, and boundaries.

Aitoff

This example displays a world map using the Aitoff projection, a compromise projection that represents the entire globe in an ellipse. The map shows landmasses in dark gray and country boundaries as white lines over a graticule of latitude and longitude lines. Built with D3 v3 and the `d3.geo.aitoff` projection from the geo.projection plugin, it uses `d3.geo.path` to render the sphere, graticule, and land features. The world data is loaded as TopoJSON from a remote gist and processed with `topojson.feature` and `topojson.mesh`.

August Projection

This example displays a world map using the August projection, a pseudocylindrical equal-area projection that curves parallels and meridians into distinctive intertwined shapes. The map renders land masses in dark gray with white country boundaries overlaid on a graticule, all enclosed within a spherical outline. Using D3 v3, the code employs `d3.geo.august` for the projection, `d3.geo.path` to draw geographic features, and `d3.geo.graticule` for the grid. TopoJSON data provides the world land and country boundaries, loaded from an external JSON file.

Mercator Projection

This example displays a world map using a Mercator projection, with each country rendered as a gray shape outlined in white. The map is built with the D3.js version 3 library, using `d3.geo.mercator()` to define the projection and `d3.geo.path()` to convert GeoJSON geometries into SVG paths. The geographical data comes from a `countries.json` file containing feature collections loaded via `d3.json()`. The resulting visualization, rendered in an SVG element, demonstrates the classic distortion of landmasses toward the poles inherent to this projection method.

PPatrick Wojda

Gall–Peters

This example demonstrates the Gall–Peters projection, an equal-area map projection that preserves relative sizes of landmasses. The visualization displays a dark world map with country boundaries drawn in white, overlaid on a graticule grid. The map is rendered using SVG via the d3.geo.path and d3.geo.cylindricalEqualArea APIs, with the projection configured with a 45-degree parallel. Geographic data comes from a 50m-resolution world TopoJSON file, processed through the topojson library to extract land and boundary features.

68% match

Eckert IV

This example demonstrates the Eckert IV map projection, a pseudocylindrical equal-area projection that renders the entire world on a 960 by 500 pixel SVG canvas. The visualization displays the projected globe with graticule lines, landmasses in dark gray, and country boundaries in white. Using D3.js v3, the code employs `d3.geo.eckert4()` alongside the `d3.geo.path`, `d3.geo.graticule`, and the `d3.geo.projection` plugin to construct paths. World map data comes from a GeoJSON file containing 50-meter resolution land and country features, processed through TopoJSON.

68% match

Azimuthal Equidistant

This example demonstrates the azimuthal equidistant projection, a map projection that preserves accurate distances from a central point. The map is centered on San Francisco, with the world rendered using outlines and filled landmasses. The visualization uses D3’s `d3.geoAzimuthalEquidistant` projection and `d3.geoPath` to draw the sphere, graticule, and geographic features. Land and boundary data come from a world-atlas TopoJSON file, processed using the `topojson-client` library. The SVG output includes a graticule, a stroked sphere outline, and a white-filled sphere background.