isolines
描述
¥Description
获取一个包含 点 个特性、z 值和一个值分隔数组的网格 FeatureCollection,并生成 isolines。
¥Takes a grid FeatureCollection of Point features with z-values and an array of value breaks and generates isolines.
参数
¥Parameters
名称 | 类型 | 描述 |
---|---|---|
pointGrid | FeatureCollection<点> | 输入点 |
breaks | 数组<number> | zProperty 的值用于指定绘制等值线的位置 |
options? | 对象 | 可选参数(默认 {}) |
options.zProperty? | string | points 中用于提取 z 值的属性名称(默认值为 'elevation') |
options.commonProperties? | 对象 | 传递给所有等值线的 GeoJSON 属性(默认 {}) |
options.breaksProperties? | 数组<对象> | 按顺序将 GeoJSON 属性传递给相应的等值线;breaks 数组将定义等值线的创建顺序(默认为 []) |
返回
¥Returns
FeatureCollection<MultiLineString> 表示等值线的 MultiLineString 特性的 FeatureCollection 等值线
¥FeatureCollection<MultiLineString> a FeatureCollection of MultiLineString features representing isolines
示例
¥Examples
// create a grid of points with random z-values in their properties
var extent = [0, 30, 20, 50];
var cellWidth = 100;
var pointGrid = turf.pointGrid(extent, cellWidth, { units: "miles" });
for (var i = 0; i < pointGrid.features.length; i++) {
pointGrid.features[i].properties.temperature = Math.random() * 10;
}
var breaks = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var lines = turf.isolines(pointGrid, breaks, { zProperty: "temperature" });
安装
¥Installation
$ npm install @turf/isolines
import { isolines } from "@turf/isolines";
const result = isolines(...);
$ npm install @turf/turf
import * as turf from "@turf/turf";
const result = turf.isolines(...);