88 lines
2.7 KiB
Markdown
88 lines
2.7 KiB
Markdown
# @turf/simplify
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<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
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## simplify
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Takes a [GeoJSON][1] object and returns a simplified version. Internally uses
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[simplify-js][2] to perform simplification using the Ramer-Douglas-Peucker algorithm.
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**Parameters**
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- `geojson` **[GeoJSON][3]** object to be simplified
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- `options` **[Object][4]** Optional parameters (optional, default `{}`)
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- `options.tolerance` **[number][5]** simplification tolerance (optional, default `1`)
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- `options.highQuality` **[boolean][6]** whether or not to spend more time to create a higher-quality simplification with a different algorithm (optional, default `false`)
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- `options.mutate` **[boolean][6]** allows GeoJSON input to be mutated (significant performance increase if true) (optional, default `false`)
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**Examples**
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```javascript
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var geojson = turf.polygon([[
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[-70.603637, -33.399918],
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[-70.614624, -33.395332],
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[-70.639343, -33.392466],
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[-70.659942, -33.394759],
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[-70.683975, -33.404504],
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[-70.697021, -33.419406],
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[-70.701141, -33.434306],
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[-70.700454, -33.446339],
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[-70.694274, -33.458369],
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[-70.682601, -33.465816],
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[-70.668869, -33.472117],
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[-70.646209, -33.473835],
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[-70.624923, -33.472117],
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[-70.609817, -33.468107],
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[-70.595397, -33.458369],
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[-70.587158, -33.442901],
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[-70.587158, -33.426283],
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[-70.590591, -33.414248],
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[-70.594711, -33.406224],
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[-70.603637, -33.399918]
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]]);
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var options = {tolerance: 0.01, highQuality: false};
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var simplified = turf.simplify(geojson, options);
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//addToMap
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var addToMap = [geojson, simplified]
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```
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Returns **[GeoJSON][3]** a simplified GeoJSON
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[1]: https://tools.ietf.org/html/rfc7946#section-3
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[2]: http://mourner.github.io/simplify-js/
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[3]: https://tools.ietf.org/html/rfc7946#section-3
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[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
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[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
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[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
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<!-- This file is automatically generated. Please don't edit it directly:
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if you find an error, edit the source file (likely index.js), and re-run
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./scripts/generate-readmes in the turf project. -->
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---
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This module is part of the [Turfjs project](http://turfjs.org/), an open source
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module collection dedicated to geographic algorithms. It is maintained in the
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[Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create
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PRs and issues.
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### Installation
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Install this module individually:
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```sh
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$ npm install @turf/simplify
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```
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Or install the Turf module that includes it as a function:
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```sh
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$ npm install @turf/turf
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```
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