# @turf/tin

> Takes a set of points and creates a Triangulated Irregular Network.

Latest version **7.4.0** (published 2026-08-03) · MIT license · 0 weekly downloads

## Install

```sh
npm install @turf/tin
pnpm add @turf/tin
yarn add @turf/tin
bun add @turf/tin
```

## Health

**Score 80/100 (A)** — status: active.

Positive: has types; esm support; no vulnerabilities; has provenance; recently updated; high maintenance score; high quality score; popular repo.

Warnings: low downloads.

## Facts

| | |
|---|---|
| Version | 7.4.0 |
| Published | 2026-08-03 |
| First published | 2016-07-06 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | ESM + CommonJS |
| Dependencies | 3 |
| Unpacked size | 44.1 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 10490 |
| Author | Turf Authors |
| Maintainers | rowanwins, tmcw, morganherlocker, tcql, mdfedderly, twelch, jamesmilneruk, morgan.herlocker |
| Keywords | turf, tin, triangulate |

## Links

- npm: https://www.npmjs.com/package/@turf/tin
- Repository: https://github.com/Turfjs/turf
- Issues: https://github.com/Turfjs/turf/issues
- Funding: https://opencollective.com/turf
- npm.io page: https://npm.io/package/@turf/tin

## Dependencies (3)

- [tslib](https://npm.io/package/tslib.md) ^2.8.1
- [@turf/helpers](https://npm.io/package/@turf/helpers.md) 7.4.0
- [@types/geojson](https://npm.io/package/@types/geojson.md) ^7946.0.10

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## Recent versions

- 7.4.0 (latest) — 2026-08-03
- 7.1.0-alpha.70 (prerelease) — 2024-08-09
- 3.5.2-alpha.d2c36ee7 (canary) — 2016-11-04
- 7.3.5 — 2026-04-19
- 7.3.4 — 2026-02-08
- 7.3.3 — 2026-01-28
- 7.3.2 — 2026-01-14
- 7.3.1 — 2025-11-27
- 7.3.0 — 2025-11-17
- 7.2.0 — 2024-12-29
- 7.1.0 — 2024-08-09
- 7.1.0-alpha.7 — 2024-06-25
- 7.0.0 — 2024-06-07
- 7.0.0-alpha.116 — 2024-05-07
- 7.0.0-alpha.115 — 2024-04-23
- … 48 more at https://npm.io/package/@turf/tin/versions

## README

# @turf/tin

<!-- Generated by documentation.js. Update this documentation by updating the source code. -->

## tin

Takes a set of [points][1] and creates a
[Triangulated Irregular Network][2],
or a TIN for short, returned as a collection of Polygons. These are often used
for developing elevation contour maps or stepped heat visualizations.

If an optional z-value property is provided then it is added as properties called `a`, `b`,
and `c` representing its value at each of the points that represent the corners of the
triangle.

### Parameters

*   `points` **[FeatureCollection][3]<[Point][1]>** input points
*   `z` **[String][4]?** name of the property from which to pull z values
    This is optional: if not given, then there will be no extra data added to the derived triangles.

### Examples

```javascript
// generate some random point data
var points = turf.randomPoint(30, {bbox: [50, 30, 70, 50]});

// add a random property to each point between 0 and 9
for (var i = 0; i < points.features.length; i++) {
  points.features[i].properties.z = ~~(Math.random() * 9);
}
var tin = turf.tin(points, 'z');

//addToMap
var addToMap = [tin, points]
for (var i = 0; i < tin.features.length; i++) {
  var properties  = tin.features[i].properties;
  properties.fill = '#' + properties.a + properties.b + properties.c;
}
```

Returns **[FeatureCollection][3]<[Polygon][5]>** TIN output

[1]: https://tools.ietf.org/html/rfc7946#section-3.1.2

[2]: http://en.wikipedia.org/wiki/Triangulated_irregular_network

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

[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String

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

<!-- This file is automatically generated. Please don't edit it directly. If you find an error, edit the source file of the module in question (likely index.js or index.ts), and re-run "yarn docs" from the root of the turf project. -->

---

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

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

Or install the all-encompassing @turf/turf module that includes all modules as functions:

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

---
_Source: https://npm.io/package/@turf/tin · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._