turf polygon smooth module

Usage no npm install needed!

<script type="module">
  import turfPolygonSmooth from 'https://cdn.skypack.dev/@turf/polygon-smooth';




Smooths a Polygon or MultiPolygon. Based on Chaikin's algorithm. Warning: may create degenerate polygons.


  • inputPolys (FeatureCollection | Feature<(Polygon | MultiPolygon)>) (Multi)Polygon(s) to smooth
  • options Object Optional parameters (optional, default {})
    • options.iterations string THe number of times to smooth the polygon. A higher value means a smoother polygon. (optional, default 1)


var polygon = turf.polygon([[[11, 0], [22, 4], [31, 0], [31, 11], [21, 15], [11, 11], [11, 0]]]);

var smoothed = turf.polygonSmooth(polygon, {iterations: 3})

var addToMap = [smoothed, polygon];

Returns FeatureCollection<Polygon> FeatureCollection containing the smoothed polygon/poylgons

This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.


Install this module individually:

$ npm install @turf/polygon-smooth

Or install the Turf module that includes it as a function:

$ npm install @turf/turf