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map-design

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Make real, accurate maps as one self-contained HTML, SVG and PNG. Choropleths by country, state, province or US county, or by any boundaries in the user's own GeoJSON, TopoJSON or KML (districts, ZIP codes, wards, constituencies, sales territories); bubble, spike and point maps; routes, voyages and GPS tracks from GPX; flow maps; locator maps with an inset globe; and OpenStreetMap city posters. Use whenever the user asks for a map, a "where is" graphic, data by country/state/county/region/district, a trip, flight, run or ride, a city poster, or any geographic visualization. Ships Natural Earth, US Census and OurAirports data, so coastlines, borders and coordinates are real rather than drawn from memory.

skills/map-design/SKILL.md

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10
Repository last updated
Oct 28, 2026
License
MIT

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# Map Design

You cannot draw a coastline from memory, and neither can any model. This skill
gives you real geography: bundled boundary data, an offline gazetteer, proper
projections, and a renderer with an editorial design system. You write a short
JSON spec; the CLI draws the map.

**Never hand-write map geometry, SVG paths or coordinates for countries,
coasts or borders.** Always go through `scripts/map.mjs`.

`<skill-dir>` below is this skill's base directory. The CLI needs Node.js 20+
and nothing else. PNG export uses a local Chrome, Edge, Brave or Chromium if
one exists; HTML and SVG always work.