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Version: 7.3.0

geomReduce

描述​

🌐 Description

减少任何 GeoJSON 对象中的几何体，类似于 Array.reduce()。

🌐 Reduce geometry in any GeoJSON object, similar to Array.reduce().

参数​

🌐 Parameters

名称类型描述
geojsonFeatureCollection | Feature | GeometryObject | GeometryCollection | Feature<GeometryCollection>任意 GeoJSON 对象
callbackgeomReduceCallback一个方法，接受参数 (previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId)
initialValue?Reducer用作 callback 第一次调用第一个参数的值

返回​

🌐 Returns

归约器 归约操作的结果值。

示例​

🌐 Examples

var features = turf.featureCollection([
  turf.point([26, 37], { foo: "bar" }),
  turf.point([36, 53], { hello: "world" }),
]);

turf.geomReduce(
  features,
  function (
    previousValue,
    currentGeometry,
    featureIndex,
    featureProperties,
    featureBBox,
    featureId,
  ) {
    //=previousValue
    //=currentGeometry
    //=featureIndex
    //=featureProperties
    //=featureBBox
    //=featureId
    return currentGeometry;
  },
);

安装​

🌐 Installation

$ npm install @turf/meta

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

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