A modular geospatial engine written in JavaScript
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/bufferIn 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)
- Swift (iOS, macOS, tvOS, watchOS, Linux)
-
Turf for Swift is experimental and its public API is subject to change. Please use with care.
-
- Dart/Flutter (Dart Web, Dart Native; Flutter for iOS, Android, macOS, Windows, Linux, Web)
-
The Turf for Dart port is still in progress, the implementation status can be found in the README.
-
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: {}
};Browser support
Turf packages are compiled to target ES2017. However, the browser version of @turf/turf is transpiled to also include support for IE11. If you are using these packages and need to target IE11, please transpile the following packages as part of your build:
@turf/*
robust-predicates
rbush
tinyqueue
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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