# @turf/dissolve

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## dissolve

Dissolves a FeatureCollection of [polygon][1] features, filtered by an optional property name:value.
Note that [mulitpolygon][2] features within the collection are not supported

**Parameters**

- `featureCollection` **[FeatureCollection][3]&lt;[Polygon][4]>** input feature collection to be dissolved
- `options` **[Object][5]** Optional parameters (optional, default `{}`)
  - `options.propertyName` **[string][6]?** features with equals 'propertyName' in `properties` will be merged

**Examples**

```javascript
var features = turf.featureCollection([
  turf.polygon(
    [
      [
        [0, 0],
        [0, 1],
        [1, 1],
        [1, 0],
        [0, 0],
      ],
    ],
    { combine: "yes" }
  ),
  turf.polygon(
    [
      [
        [0, -1],
        [0, 0],
        [1, 0],
        [1, -1],
        [0, -1],
      ],
    ],
    { combine: "yes" }
  ),
  turf.polygon(
    [
      [
        [1, -1],
        [1, 0],
        [2, 0],
        [2, -1],
        [1, -1],
      ],
    ],
    { combine: "no" }
  ),
]);

var dissolved = turf.dissolve(features, { propertyName: "combine" });

//addToMap
var addToMap = [features, dissolved];
```

Returns **[FeatureCollection][3]&lt;[Polygon][4]>** a FeatureCollection containing the dissolved polygons

[1]: polygon
[2]: mulitpolygon
[3]: https://tools.ietf.org/html/rfc7946#section-3.3
[4]: https://tools.ietf.org/html/rfc7946#section-3.1.6
[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String

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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/dissolve
```

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

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