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Version: 7.2.0

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
geojsonFeatureCollection | 特性 | 几何图形任何 GeoJSON 要素或几何图形
options?对象可选参数(默认 {})
options.featureIndex?number要素索引(默认 0)
options.multiFeatureIndex?number多要素索引(默认值为 0)
options.geometryIndex?number几何体索引(默认 0)
options.coordIndex?number坐标索引(默认 0)
options.properties?对象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 转换为输出点(默认 {})

返回

¥Returns

特性<> 2 顶点 GeoJSON 要素点

¥Feature<Point> 2-vertex GeoJSON Feature Point

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(...);