collect

描述

🌐 Description

将来自点的 FeatureCollection 的指定属性合并到多边形的 FeatureCollection 中。给定点的 inProperty 和多边形的 outProperty，它会找到位于每个多边形内的每个点，收集这些点的 inProperty 值，并将它们作为数组添加到多边形的 outProperty 上。

🌐 Merges a specified property from a FeatureCollection of points into a FeatureCollection of polygons. Given an inProperty on points and an outProperty for polygons, this finds every point that lies within each polygon, collects the inProperty values from those points, and adds them as an array to outProperty on the polygon.

参数

🌐 Parameters

名称	类型	描述
polygons	FeatureCollection<Polygon>	带有可用于聚合值的多边形
points	FeatureCollection<Point>	要汇总的点
inProperty	string	要嵌套的属性
outProperty	string	要嵌套的属性

返回

🌐 Returns

FeatureCollection<Polygon> 具有基于 outField 列出的属性的多边形

示例

🌐 Examples

var poly1 = turf.polygon([
  [
    [0, 0],
    [10, 0],
    [10, 10],
    [0, 10],
    [0, 0],
  ],
]);
var poly2 = turf.polygon([
  [
    [10, 0],
    [20, 10],
    [20, 20],
    [20, 0],
    [10, 0],
  ],
]);
var polyFC = turf.featureCollection([poly1, poly2]);
var pt1 = turf.point([5, 5], { population: 200 });
var pt2 = turf.point([1, 3], { population: 600 });
var pt3 = turf.point([14, 2], { population: 100 });
var pt4 = turf.point([13, 1], { population: 200 });
var pt5 = turf.point([19, 7], { population: 300 });
var pointFC = turf.featureCollection([pt1, pt2, pt3, pt4, pt5]);
var collected = turf.collect(polyFC, pointFC, "population", "values");
var values = collected.features[0].properties.values;
//=values => [200, 600]

安装

🌐 Installation

$ npm install @turf/collect

import { collect } from "@turf/collect";
const result = collect(...);

$ npm install @turf/turf

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