topojson.topology + topojson.mesh

d3.geoPath + Canvas

This example displays a map of the United States drawn entirely on a Canvas element. It shows how D3’s `d3.geoPath` can render geographic data into a native Canvas context rather than an SVG, with the map’s geometry provided by the `us-atlas` dataset. The code uses `d3.json` to load the TopoJSON file and `topojson.mesh` to convert it into renderable shapes. The resulting path is stroked onto the canvas via the `context` set on `d3.geoPath`, demonstrating a performant alternative to SVG for large spatial datasets.

85% match

d3.geoPath + Canvas

This example renders the U.S. state boundaries from the `us-atlas` TopoJSON file onto an HTML5 Canvas element. It uses `d3.geoPath` with a Canvas context to draw the map, demonstrating that this projection API works outside of SVG. The code fetches the geographic data from `10m.json`, converts it with `topojson.mesh`, and strokes the resulting paths with a single `beginPath` and `stroke` call. The approach eliminates SVG overhead by relying on Canvas rendering.

FFrissAnalytics

84% match

U.S. TopoJSON

This example displays a layered map of the United States using county, state, and national boundaries. The map is rendered as SVG, with counties stroked in thin gray, states in thin black, and the nation in a thicker black outline. It loads TopoJSON data from the us-atlas package and uses the topojson-client library to compute and draw the geographic meshes and features. The visualization is built with d3.v4, using d3.json for data fetching and d3.geoPath for path generation.

82% match

USA Country Map with Topojson data

This example displays a choropleth-style map of the United States, with each state rendered as a separate SVG path using a topojson dataset. It shows state boundaries and names via tooltips. The code uses D3 v5’s `geoAlbersUsa` projection and `geoPath` to generate the paths, while `topojson.feature` converts the TopoJSON topology into GeoJSON features. The map is drawn with SVG elements, and the data is loaded asynchronously from a GitHub gist using D3’s `json` method.

NNaveenrajaYalagandula

81% match

USA Map with TOPO JSON Data

This example presents a stylized map of the United States, displaying state boundaries and land masses with distinct colors for spheres and geographic regions. The visualization renders as an SVG and uses React to manage the component lifecycle. It loads geographic data from the US Atlas TopoJSON, converting it with `topojson.feature` and `topojson.mesh`, then projects it using `d3.geoAlbers` and `d3.geoPath`. Graticules are included via `d3.geoGraticule`, though not explicitly drawn in the component.

Ggopiganta

d3.geoPath + node-canvas

This example demonstrates how to render geographic data to a Canvas element using d3.geoPath with node-canvas, producing a stroked mesh of United States county boundaries. The rasterize script loads US Atlas TopoJSON data, converts it to GeoJSON with topojson-client, and passes it through d3.geoPath’s context method to draw paths into a 960×600 canvas. It then writes the resulting bitmap to a PNG file, showing server-side vector-to-raster conversion without a browser.

U.S. States TopoJSON

This example shows a map of the United States rendered as SVG paths, where individual states turn red when hovered. The map uses the TopoJSON `us-atlas` file, loaded via `d3.json`, and the code relies on the `topojson` library to convert the TopoJSON topology into geographic features. The rendering is done with `d3.geoPath` to project the geometry, and state borders are drawn as a separate path using a mesh that highlights each boundary. No interaction beyond the hover effect is implemented.

us2.json

This example displays county boundaries from the US Census Bureau using a TopoJSON file. It renders the geometries onto an SVG or Canvas element with the D3.js library, employing `d3.geoPath` to project and draw the polygons. The visualization is interactive, allowing users to pan and zoom across the map. The code initializes a map projection and fits the path generator to the geographic extent defined in the TopoJSON metadata.

JJn1532