@turf/buffer

What is @turf/buffer?

@turf/buffer is a module from the Turf.js library that allows you to create buffer zones around geometries. This is useful for spatial analysis tasks such as determining areas of influence, proximity analysis, and more.

What are @turf/buffer's main functionalities?

Create Buffer Around Point

This feature allows you to create a buffer zone around a point geometry. In this example, a buffer of 5 miles is created around a point with coordinates [-90.548630, 14.616599].

const turf = require('@turf/turf');
const point = turf.point([-90.548630, 14.616599]);
const buffered = turf.buffer(point, 5, {units: 'miles'});
console.log(buffered);

Create Buffer Around LineString

This feature allows you to create a buffer zone around a LineString geometry. In this example, a buffer of 10 kilometers is created around a line defined by two points.

const turf = require('@turf/turf');
const line = turf.lineString([[-90.548630, 14.616599], [-90.548630, 15.616599]]);
const buffered = turf.buffer(line, 10, {units: 'kilometers'});
console.log(buffered);

Create Buffer Around Polygon

This feature allows you to create a buffer zone around a Polygon geometry. In this example, a buffer of 2 miles is created around a polygon defined by a set of coordinates.

const turf = require('@turf/turf');
const polygon = turf.polygon([[[-90.548630, 14.616599], [-90.548630, 15.616599], [-89.548630, 15.616599], [-89.548630, 14.616599], [-90.548630, 14.616599]]]);
const buffered = turf.buffer(polygon, 2, {units: 'miles'});
console.log(buffered);

Other packages similar to @turf/buffer

jsts

JSTS (JavaScript Topology Suite) is a JavaScript library for performing various spatial operations, including buffering. It is more comprehensive than @turf/buffer and includes a wide range of geometric operations, but it is also more complex to use.

geolib

Geolib is a library for geospatial calculations in JavaScript. While it does not offer as many features as @turf/buffer, it provides basic functionalities like distance calculations and bounding boxes, which can be useful for simpler tasks.

leaflet

Leaflet is a popular open-source JavaScript library for interactive maps. While it is primarily used for map rendering, it also includes some spatial analysis features, including buffering, through various plugins. It is more focused on visualization than @turf/buffer.

README

@turf/buffer

buffer

Calculates a buffer for input features for a given radius. Units supported are miles, kilometers, and degrees.

When using a negative radius, the resulting geometry may be invalid if it's too small compared to the radius magnitude. If the input is a FeatureCollection, only valid members will be returned in the output FeatureCollection - i.e., the output collection may have fewer members than the input, or even be empty.

Parameters

• geojson (FeatureCollection | Geometry | Feature<any>) input to be buffered
• radius number distance to draw the buffer (negative values are allowed)
• units [string] any of the options supported by turf units (optional, default kilometers)
• steps [number] number of steps (optional, default 64)

Examples

var point = turf.point([-90.548630, 14.616599]);
var buffered = turf.buffer(point, 500, 'miles');

//addToMap
var addToMap = [point, buffered]

Returns (FeatureCollection | Feature<(Polygon | MultiPolygon)> | undefined) buffered features

---

This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.

Installation

Install this module individually:

$ npm install @turf/buffer

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

$ npm install @turf/turf

Changelog

4.6.0

🚀 New Modules

• @turf/clean-coords Removes redundant coordinates from any GeoJSON Geometry. (PR https://github.com/Turfjs/turf/pull/875 - Author @stebogit)
• @turf/interpolate Takes a set of points and estimates their 'property' values on a grid using the Inverse Distance Weighting (IDW) method.. (PR https://github.com/Turfjs/turf/pull/832 - Author @stebogit)
• @turf/clusters-dbscan Takes a set of Points and partition them into clusters according to DBSCAN's data clustering algorithm. (PR https://github.com/Turfjs/turf/pull/812 and https://github.com/Turfjs/turf/pull/851 - Author @DenisCarriere)

  special mention to this incredibly instructive and fun interactive map by @DenisCarriere 😎👏

• @turf/clusters Provides getCluster, clusterEach, and clusterReduce functions. (PR https://github.com/Turfjs/turf/pull/847 - Author @DenisCarriere)
• @turf/boolean-point-on-line Returns true if a point is on a line. Accepts a optional parameter to ignore the start and end vertices of the linestring. (PR https://github.com/Turfjs/turf/pull/858 - Author @rowanwins)
• @turf/boolean-overlap Takes two features and returns true or false whether or not they overlap, i.e. whether any pair of edges on the two polygons intersect. If there are any edge intersections, the polygons overlap. (PR https://github.com/Turfjs/turf/pull/856 and https://github.com/Turfjs/turf/pull/868 - Author @stebogit @tcql)
• @turf/boolean-equal Determine whether two geometries of the same type have identical X,Y coordinate values. (PR https://github.com/Turfjs/turf/pull/869 - Author @stebogit @tcql)

🏅 New Features/Enhancements

• Sets centered param default to true in @turf/point-grid (PR https://github.com/Turfjs/turf/pull/836 - Contributor @stebogit)
• Adds MultiLineString support for @turf/point-on-line (PR https://github.com/Turfjs/turf/pull/838 - Contributor @stebogit)
• Renames @turf/clusters => @turf/clusters-kmeans, plus adds deprecated warning message to @turf/clusters@4.5.2 (See Issue https://github.com/Turfjs/turf/issues/845)
• Changes output type of @turf/clusters-kmeans (See Issue https://github.com/Turfjs/turf/issues/850 - Contributor @DenisCarriere)
• Adds segmentEach and segmentReduce functions to @turf/meta (See Issue https://github.com/Turfjs/turf/issues/850 - Contributor @DenisCarriere)
• Adds tests and linting on JSDoc in TurfJS core from turf-www; see Issue https://github.com/Turfjs/turf/issues/859 (PR https://github.com/Turfjs/turf/issues/857 + https://github.com/Turfjs/turf/issues/864 + https://github.com/Turfjs/turf/issues/870 - Contributor @DenisCarriere @stebogit)
• Introduces null Geometry support across TurfJS modules (See Issue https://github.com/Turfjs/turf/issues/853) (PR https://github.com/Turfjs/turf/issues/866 - Contributor @DenisCarriere)
• Includes feature(Sub)Index in coordEach/coordReduce (@turf/meta) 🎉 (PR https://github.com/Turfjs/turf/issues/872 - Contributor @DenisCarriere)
• Adds bbox and id params plus geometry method to @turf/helpers (PR https://github.com/Turfjs/turf/issues/877 - Contributor @DenisCarriere)

🐛 Bug Fixes

• Applies @turf/truncate to @turf/line-split splitter input to avoid approximation errors. Fixed #852 (PR https://github.com/Turfjs/turf/pull/855)
• Fixes @turf-mask error (See Issue https://github.com/Turfjs/turf/issues/837) (PR https://github.com/Turfjs/turf/pull/865 - Contributor @thiagoxvo)
• Fixes create-new-module script error on LICENSE file creation (See Issue https://github.com/Turfjs/turf/issues/861) (commit df6986e)
• Fixes @turf/isobands error on commonProperties (See Issue https://github.com/Turfjs/turf/issues/831) (commit 1663f07)