@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

random

Generates random GeoJSON data, including Points and Polygons, for testing and experimentation.

Parameters

• type [string] type of features desired: 'points' or 'polygons' (optional, default 'point')
• count [number] how many geometries should be generated. (optional, default 1)
• options Object options relevant to the feature desired. Can include:
  • options.bbox Array<number> a bounding box inside of which geometries are placed. In the case of Point features, they are guaranteed to be within this bounds, while Polygon features have their centroid within the bounds.
  • options.num_vertices [number] options.vertices the number of vertices added to polygon features. (optional, default 10)
  • options.max_radial_length [Number] the total number of decimal degrees longitude or latitude that a polygon can extent outwards to from its center. (optional, default 10)

Examples

var points = turf.random('points', 100, {
  bbox: [-70, 40, -60, 60]
});

var polygons = turf.random('polygons', 4, {
  bbox: [-70, 40, -60, 60]
});

//addToMap
var addToMap = [points, polygons]

Returns FeatureCollection generated random 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/random

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

$ npm install @turf/turf

Changelog

4.7.0

🚀 New Modules

[@turf/projection][projection]

• toMercator: Converts a WGS84 GeoJSON object into Mercator (EPSG:900913) projection
• toWgs84: Converts a Mercator (EPSG:900913) GeoJSON object into WGS84 projection

(PR https://github.com/Turfjs/turf/pull/927 - Author @stebogit)

[@turf/point-to-line-distance][point-to-line-distance]

Returns the minimum distance between a {@link Point} and a {@link LineString}, being the distance from a line the minimum distance between the point and any segment of the LineString.

(PR https://github.com/Turfjs/turf/pull/925 - Author @stebogit)

[@turf/boolean-within][boolean-within]

Boolean-within returns true if the first geometry is completely within the second geometry. The interiors of both geometries must intersect and, the interior and boundary of the primary (geometry a) must not intersect the exterior of the secondary (geometry b). Boolean-within returns the exact opposite result of the [@turf/boolean-contains][boolean-contains].

(PR https://github.com/Turfjs/turf/pull/924 - Author @rowanwins)

🏅 New Features/Enhancements

• Updates [@turf/unkink-polygon][unkink-polygon] testing & added flattenEach instead of using flatten. (PR https://github.com/Turfjs/turf/pull/889)
• [@turf/concave][concave] refactoring, replacing [@turf/union][union] with geojson-dissolve to increase speed and added support to null geometries (PR https://github.com/Turfjs/turf/pull/907 - Contributor @stebogit @DenisCarriere)
• Adds doc note on [@turf/polygonize][polygonize] about "Edges must be correctly noded" (PR https://github.com/Turfjs/turf/pull/898 - Contributor @stebogit @NickCis)
• Adds support to foreign Members to [@turf/clone][clone] (PR https://github.com/Turfjs/turf/pull/904 - Contributor @DenisCarriere)
• Extends support of any GeoJSON to [@turf/simplify][simplify] (PR https://github.com/Turfjs/turf/pull/903 - Contributor @DenisCarriere @stebogit)
• Adds new isNumber function and improves type checking for few [@turf/helpers][helpers] methods (PR https://github.com/Turfjs/turf/pull/920 - Contributor @DenisCarriere @stebogit)
• Adds throw errors to invalid MultiPolygons for [@turf/simplify][simplify] (PR https://github.com/Turfjs/turf/pull/922 - Contributor @DenisCarriere)

🐛 Bug Fixes

• Fixes @turf/bbox-clip point intersection handling, adding sanity-checks the lineclip output (PR https://github.com/Turfjs/turf/pull/886)
• Fixes [@turf/line-split][line-split] endpoint case handling applying [@turf/truncate][truncate] on splitter (PR https://github.com/Turfjs/turf/pull/892 and https://github.com/Turfjs/turf/pull/855 - Contributor @stebogit)
• Fixes [@turf/intersect][intersect] throwing "uncaught exception", adding [@turf/truncate][truncate] to inputs and returning Feature<null> if no geometry (PR https://github.com/Turfjs/turf/pull/890 - Contributor @stebogit @vicvolk)
• Fixes [@turf/hex-grid][hex-grid] not properly cloning the last ring vertex (PR https://github.com/Turfjs/turf/pull/897 - Contributor @stebogit @DenisCarriere)
• Fixes [@turf/boolean-disjoint][boolean-disjoint] incorrect behaviour where a poly was completely contained within another poly (PR https://github.com/Turfjs/turf/pull/908 - Contributor @rowanwins)
• Fixes [@turf/simplify][simplify] process pending on particular geometries, applying [@turf/clean-coords][clean-coords] to input. (PR https://github.com/Turfjs/turf/pull/903 - Contributor @stebogit @DenisCarriere)
• Fixes boolean properties not being translated with [@turf/clone][clone] (PR https://github.com/Turfjs/turf/pull/909 - Contributor @DenisCarriere)
• Fixes [@turf/boolean-contains][boolean-contains] incorrect output when checking two polygons (PR https://github.com/Turfjs/turf/pull/923 - Contributor @rowanwins @DenisCarriere)