concave

描述

¥Description

获取一组 points，并返回一个凹包多边形或多多边形。内部使用 turf-tin 生成几何体。

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

参数

¥Parameters

名称	类型	描述
points	FeatureCollection<点>	输入点
options?	对象	可选参数（默认 {}）
options.maxEdge?	number	使部分包体凹陷所需的边长（在 'units' 中）。(默认 Infinity)
options.units?	string	可以是度、弧度、英里或千米（默认 'kilometers'）

返回

¥Returns

特性<多边形 | MultiPolygon> | null 凹包（如果无法计算包则返回 null 值）

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

示例

¥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);

安装

¥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(...);