# @turf/polygonize

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## polygonize

Polygonizes [(Multi)LineString(s)][1] into [Polygons][2].

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.

### Parameters

*   `geoJson` **([FeatureCollection][3] | [Geometry][4] | [Feature][5]<([LineString][1] | [MultiLineString][6])>)** Lines in order to polygonize

<!---->

*   Throws **[Error][7]** if geoJson is invalid.

Returns **[FeatureCollection][3]<[Polygon][2]>** Polygons created

[1]: https://tools.ietf.org/html/rfc7946#section-3.1.4

[2]: https://tools.ietf.org/html/rfc7946#section-3.1.6

[3]: https://tools.ietf.org/html/rfc7946#section-3.3

[4]: https://tools.ietf.org/html/rfc7946#section-3.1

[5]: https://tools.ietf.org/html/rfc7946#section-3.2

[6]: https://tools.ietf.org/html/rfc7946#section-3.1.5

[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error

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---

This module is part of the [Turfjs project](https://turfjs.org/), an open source module collection dedicated to geographic algorithms. It is maintained in the [Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create PRs and issues.

### Installation

Install this single module individually:

```sh
$ npm install @turf/polygonize
```

Or install the all-encompassing @turf/turf module that includes all modules as functions:

```sh
$ npm install @turf/turf
```