@turf/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 pointsoptions
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);
var addToMap = [points, hull]
Returns (Feature<(Polygon | MultiPolygon)> | null) a concave hull (null value is returned if unable to compute hull)
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/concave
Or install the Turf module that includes it as a function:
$ npm install @turf/turf