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union

描述​

¥Description

Takes a collection of input polygons and returns a combined polygon.If the input polygons are not contiguous, this function returns a multi-polygon feature.

参数​

¥Parameters

名称类型描述
featuresFeatureCollection<多边形 | MultiPolygon>输入多边形要素
options?对象可选参数（默认 ）
options.properties?GeoJsonPropertiesproperties to assign to output feature (default )

返回​

¥Returns

特性<多边形 | MultiPolygon> | null a combined polygon or multi-polygon feature, or null if there were no input polygons to combine

¥Feature<Polygon | MultiPolygon> | null a combined polygon or multi-polygon feature, or null if there were no input polygons to combine

示例​

¥Examples

const poly1 = turf.polygon(
  [
    [
      [-82.574787, 35.594087],
      [-82.574787, 35.615581],
      [-82.545261, 35.615581],
      [-82.545261, 35.594087],
      [-82.574787, 35.594087],
    ],
  ],
  { fill: "#0f0" },
);

const poly2 = turf.polygon([
  [
    [-82.560024, 35.585153],
    [-82.560024, 35.602602],
    [-82.52964, 35.602602],
    [-82.52964, 35.585153],
    [-82.560024, 35.585153],
  ],
]);

const union = turf.union(turf.featureCollection([poly1, poly2]));

安装​

¥Installation

$ npm install @turf/union

import { union } from "@turf/union";
const result = union(...);
$ npm install @turf/turf

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