@spatial/concave

concave

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

Parameters

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

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);

//addToMap
var addToMap = [points, hull]

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

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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 @spatial/concave

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

$ npm install @turf/turf