82 lines
2.4 KiB
Markdown
82 lines
2.4 KiB
Markdown
# @turf/intersect
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<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
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## intersect
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Takes two [polygon][1] or [multi-polygon][2] geometries and finds their polygonal intersection. If they don't intersect, returns null.
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**Parameters**
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- `poly1` **[Feature][3]<([Polygon][4] \| [MultiPolygon][5])>** the first polygon or multipolygon
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- `poly2` **[Feature][3]<([Polygon][4] \| [MultiPolygon][5])>** the second polygon or multipolygon
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- `options` **[Object][6]** Optional Parameters (optional, default `{}`)
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- `options.properties` **[Object][6]** Translate GeoJSON Properties to Feature (optional, default `{}`)
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**Examples**
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```javascript
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var poly1 = turf.polygon([[
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[-122.801742, 45.48565],
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[-122.801742, 45.60491],
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[-122.584762, 45.60491],
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[-122.584762, 45.48565],
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[-122.801742, 45.48565]
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]]);
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var poly2 = turf.polygon([[
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[-122.520217, 45.535693],
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[-122.64038, 45.553967],
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[-122.720031, 45.526554],
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[-122.669906, 45.507309],
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[-122.723464, 45.446643],
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[-122.532577, 45.408574],
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[-122.487258, 45.477466],
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[-122.520217, 45.535693]
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]]);
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var intersection = turf.intersect(poly1, poly2);
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//addToMap
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var addToMap = [poly1, poly2, intersection];
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```
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Returns **([Feature][3] | null)** returns a feature representing the area they share (either a [Polygon][1] or [MultiPolygon][2]). If they do not share any area, returns `null`.
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[1]: https://tools.ietf.org/html/rfc7946#section-3.1.6
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[2]: https://tools.ietf.org/html/rfc7946#section-3.1.7
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[3]: https://tools.ietf.org/html/rfc7946#section-3.2
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[4]: https://tools.ietf.org/html/rfc7946#section-3.1.6
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[5]: https://tools.ietf.org/html/rfc7946#section-3.1.7
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[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
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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/intersect
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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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