tin

描述

🌐 Description

获取一组点并创建一个不规则三角网，简称TIN，以多边形集合的形式返回。这些通常用于制作高程等高线图或阶梯热图可视化。

🌐 Takes a set of points and creates a Triangulated Irregular Network, or a TIN for short, returned as a collection of Polygons. These are often used for developing elevation contour maps or stepped heat visualizations.

如果提供了可选的 z 值属性，则它将作为名为 a、b 和 c 的属性添加，表示其在表示三角形角点的每个点的值。

🌐 If an optional z-value property is provided then it is added as properties called a, b, and c representing its value at each of the points that represent the corners of the triangle.

参数

🌐 Parameters

名称	类型	描述
points	FeatureCollection<Point>	输入点
z?	字符串	用于提取 z 值的属性名称，这是可选的：如果未提供，则不会向派生三角形添加额外数据。

返回

🌐 Returns

FeatureCollection<Polygon> TIN 输出

示例

🌐 Examples

// generate some random point data
var points = turf.randomPoint(30, { bbox: [50, 30, 70, 50] });

// add a random property to each point between 0 and 9
for (var i = 0; i < points.features.length; i++) {
  points.features[i].properties.z = ~~(Math.random() * 9);
}
var tin = turf.tin(points, "z");

安装

🌐 Installation

$ npm install @turf/tin

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

$ npm install @turf/turf

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