# turf-isolines

> turf isolines module

Latest version **3.0.12** (published 2016-07-05) · MIT license · 0 weekly downloads

> **Deprecated.** This package is deprecated.

## Install

```sh
npm install turf-isolines
pnpm add turf-isolines
yarn add turf-isolines
bun add turf-isolines
```

## Health

**Score 10/100 (F)** — status: deprecated.

Negative: deprecated.

## Facts

| | |
|---|---|
| Version | 3.0.12 |
| Published | 2016-07-05 |
| First published | 2014-05-13 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 7 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Author | morganherlocker |
| Maintainers | cspanring, cwmma, jseppi, jvrousseau, lyzidiamond, morganherlocker, mourner, tcql, tmcw |
| Keywords | turf, geojson, isolines, contours, elevation, topography |

## Links

- npm: https://www.npmjs.com/package/turf-isolines
- Repository: https://github.com/Turfjs/turf-isolines
- Issues: https://github.com/Turfjs/turf-isolines/issues
- npm.io page: https://npm.io/package/turf-isolines

## Dependencies (7)

- [turf-tin](https://npm.io/package/turf-tin.md) ^3.0.12
- [turf-bbox](https://npm.io/package/turf-bbox.md) ^3.0.12
- [turf-grid](https://npm.io/package/turf-grid.md) 1.0.1
- [turf-inside](https://npm.io/package/turf-inside.md) ^3.0.12
- [turf-square](https://npm.io/package/turf-square.md) ^3.0.12
- [turf-helpers](https://npm.io/package/turf-helpers.md) ^3.0.12
- [turf-planepoint](https://npm.io/package/turf-planepoint.md) ^3.0.12

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## Recent versions

- 3.0.12 (latest) — 2016-07-05
- 3.0.7-canary.ae89c8b3 (canary) — 2016-06-14
- 3.0.10 — 2016-06-15
- 3.0.5 — 2016-05-17
- 3.0.1 — 2016-05-16
- 3.0.0-canary.7879bf6c — 2016-05-16
- 3.0.0-canary.2f5f7167 — 2016-05-16
- 1.0.2 — 2015-02-06
- 1.0.1 — 2015-02-04
- 1.0.0 — 2014-12-11
- 0.1.1 — 2014-07-21
- 0.1.0 — 2014-06-03
- 0.0.3 — 2014-06-02
- 0.0.2 — 2014-05-13
- 0.0.1 — 2014-05-13

## README

# turf-isolines

# isolines

Takes [points](Point) with z-values and an array of
value breaks and generates [isolines](http://en.wikipedia.org/wiki/Isoline).

**Parameters**

-   `points` **FeatureCollection<Point>** input points
-   `z` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** the property name in `points` from which z-values will be pulled
-   `resolution` **[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)** resolution of the underlying grid
-   `breaks` **[Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)<[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)>** where to draw contours

**Examples**

```javascript
// create random points with random
// z-values in their properties
var points = turf.random('point', 100, {
  bbox: [0, 30, 20, 50]
});
for (var i = 0; i < points.features.length; i++) {
  points.features[i].properties.z = Math.random() * 10;
}
var breaks = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var isolined = turf.isolines(points, 'z', 15, breaks);
//=isolined
```

Returns **FeatureCollection&lt;LineString>** isolines

---

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-isolines
```

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

```sh
$ npm install turf
```

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