# @turf/convex

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## convex

Takes a [Feature][1] or a [FeatureCollection][2] and returns a convex hull [Polygon][3].

Internally this uses
the [convex-hull][4] module that
implements a [monotone chain hull][5].

**Parameters**

-   `geojson` **[GeoJSON][6]** input Feature or FeatureCollection
-   `options` **[Object][7]** Optional parameters (optional, default `{}`)
    -   `options.concavity` **[number][8]** 1 - thin shape. Infinity - convex hull. (optional, default `Infinity`)
    -   `options.properties` **[Object][7]** Translate Properties to Feature (optional, default `{}`)

**Examples**

```javascript
var points = turf.featureCollection([
  turf.point([10.195312, 43.755225]),
  turf.point([10.404052, 43.8424511]),
  turf.point([10.579833, 43.659924]),
  turf.point([10.360107, 43.516688]),
  turf.point([10.14038, 43.588348]),
  turf.point([10.195312, 43.755225])
]);

var hull = turf.convex(points);

//addToMap
var addToMap = [points, hull]
```

Returns **[Feature][9]&lt;[Polygon][10]>** a convex hull

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

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

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

[4]: https://github.com/mikolalysenko/convex-hull

[5]: http://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain

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

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

[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number

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

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

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---

This module is part of the [Turfjs project](http://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 module individually:

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

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

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