findPoint

描述

🌐 Description

使用 @turf/meta 索引从 GeoJSON 中查找特定点。

🌐 Finds a particular Point from a GeoJSON using @turf/meta indexes.

允许使用负索引。

🌐 Negative indexes are permitted.

参数

🌐 Parameters

名称	类型	描述
geojson	FeatureCollection | Feature | Geometry	任何 GeoJSON 要素或几何体
options?	Object	可选参数 (默认 {})
options.featureIndex?	number	功能索引 (默认 0)
options.multiFeatureIndex?	number	多特性索引 (默认 0)
options.geometryIndex?	number	几何索引 (默认 0)
options.coordIndex?	number	坐标索引 (默认 0)
options.properties?	Object	将属性转换为输出点 (默认 {})
options.bbox?	BBox	将 BBox 转换为输出点 (默认 {})
options.id?	number | string	将 Id 翻译为输出点 (默认 {})

返回

🌐 Returns

Feature<Point> 2顶点 GeoJSON 特性点

示例

🌐 Examples

var multiLine = turf.multiLineString([
  [
    [10, 10],
    [50, 30],
    [30, 40],
  ],
  [
    [-10, -10],
    [-50, -30],
    [-30, -40],
  ],
]);

// First Segment (defaults are 0)
turf.findPoint(multiLine);
// => Feature<Point<[10, 10]>>

// First Segment of the 2nd Multi-Feature
turf.findPoint(multiLine, { multiFeatureIndex: 1 });
// => Feature<Point<[-10, -10]>>

// Last Segment of last Multi-Feature
turf.findPoint(multiLine, { multiFeatureIndex: -1, coordIndex: -1 });
// => Feature<Point<[-30, -40]>>

安装

🌐 Installation

$ npm install @turf/meta

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

$ npm install @turf/turf

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