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Original — 792 points · 16.6 KB
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}A simplified outline is great for performance, but for a styled dotted map of a country, region, or US state — with colors, dot size, and background you control — use the free editor instead. Or feed your simplified GeoJSON straight into the SVG converter below.
Country and coastline boundaries are often traced from satellite imagery, which means a single polygon can carry thousands of coordinate points to capture every inlet and headland. Most of that detail is invisible once the shape is drawn at normal map size — it just adds file weight and slows down rendering. Simplification removes points that contribute little to the visible outline while keeping the overall shape recognizable.
This tool uses the Douglas-Peucker algorithm (via Turf.js), the same simplification method used by GIS software like QGIS and mapping libraries like Mapbox GL. It walks each line or polygon ring and drops any point that sits within your chosen tolerance of a straight line between its neighbors — the higher the tolerance, the more aggressively it prunes.
Tolerance is measured in the same units as your coordinates. For ordinary longitude/latitude GeoJSON, that's degrees, so a tolerance of 0.001 is a light touch (roughly 100 meters at the equator) while 0.05 is aggressive and will noticeably blunt sharp corners. Use a light tolerance when you need the shape to stay accurate for analysis; use a heavier one when you're only after a recognizable silhouette for a small graphic — exactly the scale a dotted map or icon is rendered at.
Everything happens in your browser: nothing you paste or upload is sent anywhere. The tool works on Points, LineStrings, Polygons, their Multi- variants, Features, and FeatureCollections, and reports the vertex count and file size before and after so you can see exactly how much you trimmed.