Mass Map Chrolopleth map

100%

Mass Map Chrolopleth map

✓ Published1🌍 Public

Last edited Oct 15, 2019

Created on Oct 13, 2019

This example displays a choropleth map of Massachusetts, with each county rendered as a purple SVG path. The map uses a custom `d3.geoAlbers` projection, centered and rotated to focus on the state, with a high scale factor for magnification. County boundaries are drawn from TopoJSON data using `d3.geoPath` and `topojson.feature`. The visualization is built with React, which loads the geographic data asynchronously and passes it to SVG path elements.

AI-generated description

Massachusetts Map enlarged

MIT Licensed

Similar vizzes

Loading thumbnail…

Mass Map Chrolopleth map

This example displays a purple choropleth map of Massachusetts, enlarged to emphasize the state's geometry. The map is rendered using SVG paths, with the projection configured through D3’s `geoAlbers` and `geoPath` functions, which use specific center, rotation, and parallels to zoom in on the region. The geographic data is loaded from a remote JSON file, and the map is built within a React application.

Wwenleicao

94% match

Loading thumbnail…

Mass Map 3

A choropleth of Massachusetts is rendered as an enlarged SVG map using a custom d3.geoAlbers projection with adjusted center, rotation, and parallels for regional focus. The code loads TopoJSON from a GitHub gist, converts it to GeoJSON via topojson.feature, and draws each polygon with d3.geoPath. Individual county paths appear in white with teal strokes, emphasizing the state’s borders. The React app fetches and displays the map within a fixed 960×500 viewport, providing a clean, minimalist view of the geography.

Wwenleicao

91% match

Loading thumbnail…

Mass Map 2

This example renders a choropleth map of Massachusetts using the Albers equal-area conic projection. It displays the state’s geographic boundaries as SVG paths, colored with a teal stroke and fill. The visualization uses React to manage state and rendering, calling `d3.geoPath` with `d3.geoAlbers` to project the GeoJSON data fetched from a GitHub gist via `d3.json`. The `topojson` library’s `feature` function converts the TopoJSON structure into GeoJSON features for plotting.

Wwenleicao

90% match

Loading thumbnail…

Massachusetts Chrolopleth map with interactive legend and viewbox

This choropleth map displays Massachusetts town boundaries colored by county, with an interactive legend that highlights matching regions on hover. The visualization uses React with D3 v5 APIs including `geoAlbers`, `geoPath`, and `scaleOrdinal` to project and render the TopoJSON geometries. A viewBox crops the map to the state, while legend hover states adjust fill opacity for focused counties. Town-to-county mappings come from a CSV gist, and geographic data originates from MassGIS shapefiles converted through ogr2ogr and mapshaper.

Wwenleicao

89% match

Loading thumbnail…

Massachusetts Chrolopleth map with interactive legend

A choropleth map of Massachusetts displays town boundaries colored by county, with an interactive legend that highlights towns in the selected county on mouse hover. Built with React and D3 v5, it uses `d3.geoAlbers` projection with custom rotation and scale via `d3.geoPath` for rendering SVG paths. The legend, implemented with HTML circles and text, updates a hovered value state to filter which towns receive the highlight. Town-county mappings come from a CSV, with geoJSON spatial data from a gist.

Wwenleicao

89% match

Loading thumbnail…

Massachusetts Chrolopleth map with interactive legend

This interactive choropleth map of Massachusetts displays county boundaries, with each town colored according to its county. A legend on the right uses an ordinal color scale and responds to mouse hover, dimming non-matching map regions and highlighting the selected county. Built with React and D3 v5, it uses `d3.geoAlbers` and `d3.geoPath` to project and render TopoJSON features converted from Massachusetts town boundary shapefiles via mapshaper. County assignments come from a CSV mapping file, and the legend uses `d3.scaleOrdinal` for color encoding.

Wwenleicao

89% match

Loading thumbnail…

Massachusetts Chrolopleth map with interactive legend

This choropleth map shows Massachusetts town boundaries colored by county, with an interactive legend that highlights matching regions on hover. The visualization uses React with d3.v5, including `d3.geoAlbers` for projection and `d3.geoPath` for rendering SVG paths from TopoJSON data. A CSV file maps towns to counties, and the legend employs `d3.scaleOrdinal` with a custom `ColorLegend` component. Hovering a legend value dims non-matching towns via reduced opacity while brightening the selected county.

Wwenleicao

88% match

Loading thumbnail…

Massachusetts Chrolopleth map

This choropleth map displays the counties of Massachusetts, with each town colored according to its assigned county via a categorical color scale. A conic conformal projection (d3.geoConicConformal) is used to render the state’s boundaries, while d3.geoPath draws the polygons from a TopoJSON source. Town-to-county mappings are loaded from a CSV file, and the color scale is a d3.scaleOrdinal. The visualization is built with React, using d3.v5 for geographic and data processing, and outputs as SVG paths.

Wwenleicao

88% match