us2.json

Gist 11520211

This example visualizes the geographic boundaries of US states and counties using a TopoJSON file that encodes land, county, and state outlines. Built with D3, it renders the map from the `us.json` TopoJSON data, which contains geometry collections for counties and states. The visualization likely uses D3's projection and path generators to draw the geographic shapes, displaying the boundaries with distinct styling for counties and states. The minimal code structure suggests a basic interactive or static map, with the data provided in a structured TopoJSON format.

CCaged

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.

83% match

USTopoJSON

This example displays a map of all U.S. counties as thin black outlines, drawn with SVG paths using the `d3.geo.path()` projection. The map is built from a TopoJSON file fetched from a gist, which contains the county geometries. When a user hovers over a county, the CSS `path:hover` rule turns it red, providing a simple interactive highlight. The code relies on D3 v3 and the `topojson.v1` library to process and render the topology data.

JJn1532

83% match

U.S. Counties TopoJSON

This map displays the boundaries of every county in the United States using data from a TopoJSON file fetched from `https://d3js.org/us-10m.v1.json`. It renders the county shapes as filled SVG paths, with a white mesh overlay showing county borders via `topojson.mesh`. Hovering over any county turns it red. The visualization is built with D3 v4, using `d3.geoPath` to project the geometry and `topojson.feature` to extract the features, relying on the `us-atlas` TopoJSON data source.

83% match

Gist 5967514

This example displays a map of U.S. counties using a TopoJSON shapefile from the U.S. Census Bureau, rendered as gray-filled paths with white borders that turn red on hover. It shows the geographic boundaries of counties and responds to clicks, though the click behavior only logs to the console. The visualization uses D3 v3’s `d3.geo.path()` to project and draw the SVG paths, and TopoJSON’s `topojson.feature` to extract GeoJSON features from the topology. The map is static, with no zoom or pan, and the hover effect is the only interactive styling.

CCaged

U.S. Counties TopoJSON Mesh

This example renders a minimalist map of U.S. counties using a TopoJSON mesh from the U.S. Census Bureau’s shapefile, served via the `us-10m.v1.json` file. The SVG visualization displays county boundaries as thin black lines with rounded joins, and overlays small circles at each arc’s starting point, revealing the topological structure of the data. The code uses `d3.geoPath` to project the mesh and `topojson.mesh` to extract boundaries, while `topojson.transform` positions the circles. Rendering is entirely SVG-based with D3 v4, and the map uses no fill, focusing purely on geometric outlines.

TopoJSON via MapBox & Leaflet

This example shows a map of the United States with county boundaries rendered as vector shapes, overlaid on a zoomable and pannable MapBox tile layer. It combines D3.js and TopoJSON to load and parse county geometries from a remote GeoJSON-like file, then uses MapBox’s Leaflet-based `L.geoJson` to display them with a simple gray outline style. The map initializes at a low zoom level, and the counties are added as a single layer after asynchronous JSON retrieval, demonstrating integration between D3’s data handling and Leaflet’s mapping API.

CCaged

U.S. TopoJSON

This visualization displays U.S. state and county boundaries extracted from a TopoJSON file served from d3js.org. A blurred, semi-transparent silhouette of the nation appears behind a solid white version, creating a subtle depth effect. The code uses d3.geoPath to render the features, while topojson.feature and topojson.mesh convert the TopoJSON data into GeoJSON paths for drawing.