turf polygonize module

Usage no npm install needed!

<script type="module">
  import turfPolygonize from 'https://cdn.skypack.dev/@turf/polygonize';




Polygonizes (Multi)LineString(s) into Polygons.

Implementation of GEOSPolygonize function (geos::operation::polygonize::Polygonizer).

Polygonizes a set of lines that represents edges in a planar graph. Edges must be correctly noded, i.e., they must only meet at their endpoints.

The implementation correctly handles:

  • Dangles: edges which have one or both ends which are not incident on another edge endpoint.
  • Cut Edges (bridges): edges that are connected at both ends but which do not form part of a polygon.


Returns FeatureCollection<Polygon> Polygons created

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/polygonize

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

$ npm install @turf/turf