A modular geospatial engine written in JavaScript

turfjs.org

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Turf is a JavaScript library for spatial analysis. It includes traditional spatial operations, helper functions for creating GeoJSON data, and data classification and statistics tools. Turf can be added to your website as a client-side plugin, or you can run Turf server-side with Node.js (see below).

Installation

In Node.js

# get all of turf
npm install @turf/turf

# or get individual packages
npm install @turf/helpers
npm install @turf/buffer

In browser

Download the minified file, and include it in a script tag. This will expose a global variable named turf.

<script src="turf.min.js" charset="utf-8"></script>

You can also include it directly from a CDN:

<script src="https://cdn.jsdelivr.net/npm/@turf/turf@6/turf.min.js"></script>

TypeScript

TypeScript definitions are packaged with each module. No DefinitelyTyped packages required.

Other languages

Ports of Turf.js are available in:

• Java (Android, Java SE)

  • The current to-do list for porting to Java

• Swift (iOS, macOS, tvOS, watchOS, Linux)

Turf for Swift is experimental and its public API is subject to change. Please use with care.

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Data in Turf

Turf uses GeoJSON for all geographic data. Turf expects the data to be standard WGS84 longitude, latitude coordinates. Check out geojson.io for a tool to easily create this data.

NOTE: Turf expects data in (longitude, latitude) order per the GeoJSON standard.

Most Turf functions work with GeoJSON features. These are pieces of data that represent a collection of properties (ie: population, elevation, zipcode, etc.) along with a geometry. GeoJSON has several geometry types such as:

• Point
• LineString
• Polygon

Turf provides a few geometry functions of its own. These are nothing more than simple (and optional) wrappers that output plain old GeoJSON. For example, these two methods of creating a point are functionally equivalent:

// Note order: longitude, latitude.
var point1 = turf.point([-73.988214, 40.749128]);

var point2 = {
  type: 'Feature',
  geometry: {
    type: 'Point',
    // Note order: longitude, latitude.
    coordinates: [-73.988214, 40.749128]
  },
  properties: {}
};

Contributors

This project exists thanks to all the people who contribute. If you are interested in helping, check out the Contributing Guide.

Backers

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Sponsors

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