Choropleth Scales

100%

Choropleth Scales

✓ Published0🌍 Public

Last edited May 12, 2016

Created on Mar 26, 2015

A choropleth map of US county unemployment rates from 2008 uses a quantize scale with a nine-color ColorBrewer scheme. The page includes radio buttons to switch between blue and rainbow palettes, or between quantize and linear scales, both producing a vertical color legend. Built with D3 v3, it uses `d3.geo.albersUsa`, `topojson`, SVG paths, and `d3.legend.color` to render the map and legends. The quantize scale maps rates from 0 to 15% into discrete bins, while the linear scale uses a gradient fill for continuous color.

AI-generated description

This choropleth encodes unemployment rates from 2008 with a quantize scale ranging from 0 to 15%. A threshold scale is a useful alternative for coloring arbitrary ranges.

Similar vizzes

Loading thumbnail…

Choropleth

This choropleth maps U.S. county-level unemployment rates from 2008, encoding values with a d3.scaleQuantize that bins rates from 0 to 15% into nine color classes. Rendered with SVG, the map uses a white state boundary overlay to delineate county borders, while the quantized color scale (from light blue to dark navy) visually distinguishes unemployment ranges. The visualization is built with D3 v4 and TopoJSON, and it includes a resize handler to scale the map responsively.

EEvertLagerberg

90% match

Loading thumbnail…

d3 chorplath map

This choropleth map of the United States displays county-level unemployment rates using a quantized color scale. The visualization renders counties as SVG paths, colored from light to dark blues based on rates from 0 to 15 percent, with state boundaries overlaid in white. Built with D3 v3, it uses `d3.geo.albersUsa` and `d3.geo.path` for projection, TopoJSON for US county and state geodata, and a queue to load JSON and TSV data asynchronously.

JJn1532

87% match

Loading thumbnail…

Quantile Choropleth

A quantile choropleth maps U.S. county unemployment rates to a nine-step blue color scale, with state boundaries overlaid in white. The d3.v3 code uses `d3.scale.quantile` and `d3.geo.albersUsa` with `d3.geo.path` to render SVG paths. Data loads via `queue` and `d3.tsv`, while TopoJSON provides county and state geometries.

Mmbostock

86% match

Loading thumbnail…

Gist 7bcb7bfb170746a20c14

This choropleth maps U.S. county-level unemployment rates from 2008, encoding values from 0 to 15% using a quantize scale with nine discrete color classes. The SVG visualization uses a Mercator projection and TopoJSON data for county and state boundaries. Unemployment data is loaded from a TSV file and joined to county IDs via a `d3.map`, with each county’s fill class (q0-9 through q8-9) assigned by the quantized rate, producing a blue sequential palette from light to dark. County boundaries are stroked in white and state borders in white with rounded joins, while the background remains transparent. The example highlights the use of quantize scales for continuous-to-discrete mapping and suggests a threshold scale as an alternative for arbitrary ranges.

11wheel

86% match

Loading thumbnail…

Choropleth map

This choropleth map displays U.S. county-level unemployment rates as of August 2016, using a threshold scale with a blue sequential color scheme. The map is rendered as SVG with `d3.geoPath` and TopoJSON data from the Census Bureau and the Bureau of Labor Statistics. A legend with a linear axis shows the percentage ranges, and hovering over a county reveals its exact rate via a tooltip. The code also demonstrates preprocessing the raw fixed-width text data into a TSV using command-line utilities like `dsv2dsv`.

EEleonore9

86% match

Loading thumbnail…

Gist d8a8c52a3d98232cd513f1f5364a6e5c

This example displays a choropleth map of U.S. county unemployment rates, using a blue sequential color scale ranging from light to dark shades. The map is rendered as SVG paths via `d3.geo.path` with an Albers USA projection, while county data is joined to `d3.map` values from an external TSV. State boundaries are drawn as a white mesh overlay using TopoJSON. The code relies on `queue`, `d3.json`, `d3.tsv`, and `d3.scale.quantize` to bin rates into nine classes.

JJn1532

86% match

Loading thumbnail…

Gist 5665764

This choropleth maps U.S. county-level unemployment rates from 2008 using a quantize scale, which assigns each county to one of nine color classes based on rates from 0 to 15%. The map is rendered with SVG paths for counties, colored via CSS classes q0-9 through q8-9, and includes state boundary outlines overlaid for context. The data is loaded from an external TSV file, and clicking a county or hovering over a state logs the element or feature to the console.

11wheel

85% match

Loading thumbnail…

Choropleth

A choropleth map of U.S. county unemployment rates for August 2016, drawn as SVG paths using `d3.geoPath`, colors each county with a `d3.scaleThreshold` and the `d3.schemeBlues` color scheme. A legend displays the color scale via a linear axis. The map uses TopoJSON from the U.S. Census Bureau and unemployment data from the Bureau of Labor Statistics, loaded with `d3.queue` and `d3.tsv`. State boundaries are overlaid as a white mesh using `topojson.mesh`.

Mmbostock

85% match