# @turf/simplify

# simplify

Takes a [GeoJSON](http://geojson.org/geojson-spec.html#geojson-objects) object and returns a simplified version. Internally uses
[simplify-js](http://mourner.github.io/simplify-js/) to perform simplification.

**Parameters**

-   `geojson` **[GeoJSON](http://geojson.org/geojson-spec.html#geojson-objects)** object to be simplified
-   `tolerance` **\[[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)]** simplification tolerance (optional, default `1`)
-   `highQuality` **\[[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)]** whether or not to spend more time to create a higher-quality simplification with a different algorithm (optional, default `false`)
-   `mutate` **\[[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)]** allows GeoJSON input to be mutated (significant performance increase if true) (optional, default `false`)

**Examples**

```javascript
var geojson = turf.polygon([[
  [-70.603637, -33.399918],
  [-70.614624, -33.395332],
  [-70.639343, -33.392466],
  [-70.659942, -33.394759],
  [-70.683975, -33.404504],
  [-70.697021, -33.419406],
  [-70.701141, -33.434306],
  [-70.700454, -33.446339],
  [-70.694274, -33.458369],
  [-70.682601, -33.465816],
  [-70.668869, -33.472117],
  [-70.646209, -33.473835],
  [-70.624923, -33.472117],
  [-70.609817, -33.468107],
  [-70.595397, -33.458369],
  [-70.587158, -33.442901],
  [-70.587158, -33.426283],
  [-70.590591, -33.414248],
  [-70.594711, -33.406224],
  [-70.603637, -33.399918]
]]);
var tolerance = 0.01;

var simplified = turf.simplify(geojson, tolerance, false);

//addToMap
var addToMap = [geojson, simplified]
```

Returns **[GeoJSON](http://geojson.org/geojson-spec.html#geojson-objects)** a simplified GeoJSON

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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/simplify
```

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

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