Gnomonic Butterfly

Waterman Butterfly

This example displays a world map using the Waterman butterfly projection, a polyhedral map projection that unfolds the globe into a butterfly-like shape. The visualization is rendered as an SVG using the D3.js v3 library and the `d3.geo.polyhedron.waterman` plugin, which defines the custom projection. The map includes a graticule, land masses, and country boundaries, with data loaded from a GeoJSON file via `d3.json`. The projection is rotated, scaled, and translated to center the map, and clipped to the sphere's outline.

85% match

Gnomonic

This example shows the world map projected using the gnomonic projection, where great circles appear as straight lines and distortion increases toward the edges. The map is clipped at a 90-degree angle, displaying landmasses in dark gray with white country boundaries over a graticule grid. The visualization uses D3 v3’s `d3.geo.gnomonic` projection and `d3.geo.path` to render SVG paths from TopoJSON world data, with the graticule drawn via `d3.geo.graticule`. The code sets projection scale, translation, and precision before loading the `world-50m.json` file.

83% match

Tetrahedric Gnomonic Projection

This example visualizes the world using a tetrahedric gnomonic projection, a polyhedral map projection that unfolds the globe onto four triangular faces. The map renders landmasses and graticules on a Canvas via `d3.geoPath`, with the projection implemented through a custom `d3.geoTetrahedralLee` function that uses `d3.geoPolyhedral` and per-face gnomonic projections. The code includes a dashed inner triangle and outlined sphere boundary, and loads world data from the World Atlas TopoJSON dataset. It also spins the projection interactively using D3's rotation APIs and renders at devicePixelRatio for sharp output.

PPhilippe Rivière

79% match

Tetrahedral Gnomonic projection Antarctic

This example visualizes the world map using the Tetrahedral Gnomonic projection, an Antarctic-centered aspect of Potter’s 1925 map projection. The globe is split across four triangular faces, each rendered with a gnomonic projection via `d3.geoPolyhedral` and `d3.geoGnomonic`. Landmasses are drawn on a Canvas with `d3.geoPath`, overlaid with graticules, and the map is interactive, allowing rotation through drag gestures using the `versor` library. Map data comes from TopoJSON world-atlas countries.

PPhilippe Rivière

Dodecahedral projection

This example displays a dodecahedral projection of the world map, unfolding the globe onto the faces of a dodecahedron using a myriahedral projection. The map, sourced from the VisionsCarto world atlas, is rendered as SVG with country boundaries and a graticule. The code computes the Voronoi faces on the sphere using `d3.geoVoronoi`, builds a spanning tree of the faces with Kruskal’s algorithm, and projects each face using a gnomonic projection via `d3.geoGnomonic`. The polyhedral arrangement and clipping are handled by `d3.geoPolyhedral` and `d3.geoPath`.

PPhilippe Rivière

Interactive Gnomonic

An interactive map renders the world in a gnomonic projection, a perspective view where great circles appear as straight lines. Moving the mouse over the SVG scene reorients the projection’s center by rotating it based on the cursor’s position, updating the displayed landmasses. The visualization uses d3.geo.gnomonic and d3.geo.path to draw the topojson world-110m data, with d3.scale.linear mapping pixel coordinates to longitude and latitude for rotation.

Polyconic

This visualization demonstrates the Polyconic map projection, a compromise projection that preserves distances along the central meridian and each parallel. It displays the world’s landmasses as solid black shapes with white country boundaries, overlaid on a graticule grid and an outlined sphere. The example uses the D3 v3 library with the `d3.geo.polyconic` projection plugin, `d3.geo.path` for rendering, and `topojson.v1` to process world-50m.json geographic data, drawing everything as SVG paths.

Rectangular Polyconic

This example demonstrates the rectangular polyconic map projection, a pseudoconical projection that renders the world with curved meridians and straight parallels. The map shows landmasses in dark gray with country boundaries in white, overlaid on a graticule grid and enclosed by a spherical outline. Built with D3.js v3, it uses `d3.geo.rectangularPolyconic` from the extended projections plugin, `d3.geo.path` for geographic rendering, and `d3.geo.graticule` to generate the grid. World geometry comes from a TopoJSON file loaded via `topojson.feature` and `topojson.mesh`.