concave

Description

Takes a set of points and returns a concave hull Polygon or MultiPolygon. Internally, this uses turf-tin to generate geometries.

Parameters

Name	Type	Description
points	FeatureCollection<Point>	input points
options?	Object	Optional parameters (default {})
options.maxEdge?	number	the length (in 'units') of an edge necessary for part of the hull to become concave. (default Infinity)
options.units?	string	can be degrees, radians, miles, or kilometers (default 'kilometers')

Returns

Feature<Polygon | MultiPolygon> | null a concave hull (null value is returned if unable to compute hull)

Examples

var points = turf.featureCollection([
  turf.point([-63.601226, 44.642643]),
  turf.point([-63.591442, 44.651436]),
  turf.point([-63.580799, 44.648749]),
  turf.point([-63.573589, 44.641788]),
  turf.point([-63.587665, 44.64533]),
  turf.point([-63.595218, 44.64765]),
]);
var options = { units: "miles", maxEdge: 1 };

var hull = turf.concave(points, options);

Installation

$ npm install @turf/concave

import { concave } from "@turf/concave";
const result = concave(...);

$ npm install @turf/turf

import * as turf from "@turf/turf";
const result = turf.concave(...);