standardDeviationalEllipse

描述

¥Description

Takes a collection of features and returns a standard deviational ellipse, also known as a “directional distribution.” The standard deviational ellipse aims to show the direction and the distribution of a dataset by drawing an ellipse that contains about one standard deviation’s worth (~ 70%) of the data.

This module mirrors the functionality of 方向分布 in ArcGIS and the QGIS 标准偏差椭圆插件

¥This module mirrors the functionality of Directional Distribution in ArcGIS and the QGIS Standard Deviational Ellipse Plugin

参数

¥Parameters

名称	类型	描述
points	FeatureCollection<点>	GeoJSON 点
options?	对象	可选参数（默认 ）
options.weight?	string	the property name used to weight the center
options.steps?	number	number of steps for the polygon (default 64)
options.properties?	对象	properties to pass to the resulting ellipse (default )

返回

¥Returns

特性<多边形> an elliptical Polygon that includes approximately 1 SD of the dataset within it.

¥Feature<Polygon> an elliptical Polygon that includes approximately 1 SD of the dataset within it.

示例

¥Examples

const bbox = [-74, 40.72, -73.98, 40.74];
const points = turf.randomPoint(400, { bbox: bbox });
const sdEllipse = turf.standardDeviationalEllipse(points);

安装

¥Installation

$ npm install @turf/standard-deviational-ellipse

import { standardDeviationalEllipse } from "@turf/standard-deviational-ellipse";
const result = standardDeviationalEllipse(...);

$ npm install @turf/turf

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