buffer

描述

¥Description

Calculates a buffer for input features for a given radius.Units supported are miles, kilometers, and degrees.

When using a negative radius, the resulting geometry may be invalid if it's too small compared to the radius magnitude.If the input is a FeatureCollection, only valid members will be returned in the output FeatureCollection - i.e., the output collection may have fewer members than the input, or even be empty.

参数

¥Parameters

名称	类型	描述
geojson	FeatureCollection | 几何图形 | 特性<any>	要缓冲的输入
radius	number	distance to draw the buffer (negative values are allowed)
options?	对象	可选参数（默认 ）
options.units?	string	any of the options supported by turf units (default "kilometers")
options.steps?	number	number of steps (default 8)

返回

¥Returns

FeatureCollection | 特性<多边形 | MultiPolygon> | undefined buffered features

¥FeatureCollection | Feature<Polygon | MultiPolygon> | undefined buffered features

示例

¥Examples

var point = turf.point([-90.54863, 14.616599]);
var buffered = turf.buffer(point, 500, { units: "miles" });

安装

¥Installation

$ npm install @turf/buffer

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

$ npm install @turf/turf

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