concave

Takes a set of points and returns a concave hull Polygon or MultiPolygon. Internally, this uses turf-tin to generate geometries.
获取一组点并返回一个凹Polygon或MultiPolygon。在内部，它使用turf-tin生成几何图形。

参数

参数	类型	描述
points	FeatureCollection <Point>	input points
options	Object	Optional parameters: see below

options选项

属性	类型	默认值	描述
maxEdge	number	Infinity	the length (in 'units') of an edge necessary for part of the hull to become concave.
units	string	kilometers	can be degrees, radians, miles, or kilometers

返回

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

示例

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);