@turf/point-on-feature

What is @turf/point-on-feature?

@turf/point-on-feature is a module from the Turf.js library that allows you to find a point on a given GeoJSON feature. This can be useful for various geospatial analyses, such as finding the centroid of a polygon or a point on a line.

What are @turf/point-on-feature's main functionalities?

Find a point on a polygon

This feature allows you to find a point on a polygon. The code sample demonstrates how to create a polygon and then find a point on it using the @turf/point-on-feature module.

const turf = require('@turf/turf');
const polygon = turf.polygon([[
  [-81, 41],
  [-81, 47],
  [-72, 47],
  [-72, 41],
  [-81, 41]
]]);
const pointOnPolygon = turf.pointOnFeature(polygon);
console.log(pointOnPolygon);

Find a point on a line

This feature allows you to find a point on a line. The code sample demonstrates how to create a line and then find a point on it using the @turf/point-on-feature module.

const turf = require('@turf/turf');
const line = turf.lineString([[-83, 30], [-84, 36], [-78, 41]]);
const pointOnLine = turf.pointOnFeature(line);
console.log(pointOnLine);

Other packages similar to @turf/point-on-feature

centroid

The 'centroid' package calculates the centroid of a polygon. While @turf/point-on-feature can find a point on any feature, 'centroid' is specifically focused on finding the centroid of polygons.

geojson-utils

The 'geojson-utils' package provides various utilities for working with GeoJSON data, including finding points on features. It offers a broader range of functionalities compared to @turf/point-on-feature, which is more specialized.

README

@turf/point-on-feature

pointOnFeature

Takes a Feature or FeatureCollection and returns a Point guaranteed to be on the surface of the feature.

• Given a Polygon, the point will be in the area of the polygon
• Given a LineString, the point will be along the string
• Given a Point, the point will the same as the input

Parameters

• geojson GeoJSON any Feature or FeatureCollection

Examples

var polygon = turf.polygon([[
  [116, -36],
  [131, -32],
  [146, -43],
  [155, -25],
  [133, -9],
  [111, -22],
  [116, -36]
]]);

var pointOnPolygon = turf.pointOnFeature(polygon);

//addToMap
var addToMap = [polygon, pointOnPolygon];

Returns Feature<Point> a point on the surface of input

---

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/point-on-feature

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

$ npm install @turf/turf