@turf/random

What is @turf/random?

@turf/random is a module within the Turf.js library that provides functions to generate random geometries such as points, polygons, and lines. It is useful for creating test data, simulations, and other applications where random spatial data is needed.

What are @turf/random's main functionalities?

Random Points

Generates a specified number of random points. In this example, it generates 5 random points.

const turf = require('@turf/random');
const points = turf.randomPoint(5);
console.log(points);

Random Polygons

Generates a specified number of random polygons. In this example, it generates 3 random polygons.

const turf = require('@turf/random');
const polygons = turf.randomPolygon(3);
console.log(polygons);

Random Lines

Generates a specified number of random line strings. In this example, it generates 2 random line strings.

const turf = require('@turf/random');
const lines = turf.randomLineString(2);
console.log(lines);

Other packages similar to @turf/random

faker

Faker is a library for generating fake data, including names, addresses, and other types of data. While it is not specifically focused on spatial data, it can be used to generate random data for various applications. Compared to @turf/random, Faker is more general-purpose and not specialized in geospatial data.

chance

Chance is a random generator helper for JavaScript. It can generate random numbers, strings, and other types of data. Like Faker, it is not specialized in geospatial data but can be used for a wide range of random data generation needs. Compared to @turf/random, Chance is more versatile but less focused on spatial data.

geojson-random

GeoJSON-Random is a library specifically designed to generate random GeoJSON data, including points, polygons, and lines. It is very similar to @turf/random in terms of functionality but is a standalone package rather than part of a larger geospatial library like Turf.js.

README

@turf/random

randomPosition

Returns a random position within a box.

Parameters

• bbox Array<number> a bounding box inside of which positions are placed. (optional, default [-180,-90,180,90])

Examples

var position = turf.randomPosition([-180, -90, 180, 90])
// => position

Returns Array<number> Position [longitude, latitude]

randomPoint

Returns a random point.

Parameters

• count number how many geometries will be generated (optional, default 1)
• options Object Optional parameters (optional, default {})
  • options.bbox Array<number> a bounding box inside of which geometries are placed. (optional, default [-180,-90,180,90])

Examples

var points = turf.randomPoint(25, {bbox: [-180, -90, 180, 90]})
// => points

Returns FeatureCollection<Point> GeoJSON FeatureCollection of points

randomPolygon

Returns a random polygon.

Parameters

• count number how many geometries will be generated (optional, default 1)
• options Object Optional parameters (optional, default {})
  • options.bbox Array<number> a bounding box inside of which geometries are placed. (optional, default [-180,-90,180,90])
  • options.num_vertices number is how many coordinates each LineString will contain. (optional, default 10)
  • options.max_radial_length number is the maximum number of decimal degrees latitude or longitude that a vertex can reach out of the center of the Polygon. (optional, default 10)

Examples

var polygons = turf.randomPolygon(25, {bbox: [-180, -90, 180, 90]})
// => polygons

Returns FeatureCollection<Polygon> GeoJSON FeatureCollection of polygons

randomLineString

Returns a random linestring.

Parameters

• count number how many geometries will be generated (optional, default 1)
• options Object Optional parameters (optional, default {})
  • options.bbox Array<number> a bounding box inside of which geometries are placed. (optional, default [-180,-90,180,90])
  • options.num_vertices number is how many coordinates each LineString will contain. (optional, default 10)
  • options.max_length number is the maximum number of decimal degrees that a vertex can be from its predecessor (optional, default 0.0001)
  • options.max_rotation number is the maximum number of radians that a line segment can turn from the previous segment. (optional, default Math.PI/8)

Examples

var lineStrings = turf.randomLineString(25, {bbox: [-180, -90, 180, 90]})
// => lineStrings

Returns FeatureCollection<LineString> GeoJSON FeatureCollection of linestrings

---

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/random

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

$ npm install @turf/turf

Changelog

6.4.0

🏅 New Features/Enhancements

• @turf/boolean-point-on-line Added an epislon option to help in floating point comparison. (PR https://github.com/Turfjs/turf/pull/2051 - Author @okcoker)

🐛 Bug Fixes

• @turf/line-slice-along Fixed a bug where the offset distance equal to the length of the line (PR https://github.com/Turfjs/turf/pull/2030 - Author @EricPKerr)

• @turf/helpers Fixed the conversion ratio for converting meters to yards and vice-versa (PR https://github.com/Turfjs/turf/pull/2046 - Author @anotherhale)

• @turf/center-median Fixed a missing TS type import (PR https://github.com/Turfjs/turf/pull/2044 - Author @Seairth)

• `@turf/bezier-spline Fix a bug ensuring the spline result reaches the end of the input (PR https://github.com/Turfjs/turf/pull/2090 - Author @the-nemz)

📖 Documentation

• @turf/transform-rotate and @turf/ellipse) Improve documentation for angle parameter (PR https://github.com/Turfjs/turf/pull/2016 - Author @pasieronen)

• @turf/line-chunk Fix an invalid anchor (PR https://github.com/Turfjs/turf/pull/2071 - Author @GraxMonzo)

• @turf/distance Enhance distance doco so supported inputs are clearer (PR https://github.com/Turfjs/turf/pull/2032 - Author @rowanwins)

🔔 Misc

• @turf/concave Replace deprecated topojson dependency (PR https://github.com/Turfjs/turf/pull/2037 - Author @elliots)

• Work towards enabling TS Strict Mode (PR https://github.com/Turfjs/turf/pull/2053 - Author @mfedderly)