点线面数据处理（wkt，geojson互转）

•   点线面数据

点：[103.8810, 31.0896]

线：[[103.7767, 30.8424],[104.2546, 30.8150],[104.3068, 30.4552]]

面：[[[103.8810, 31.0896],[104.0129, 30.8891],[103.7520, 30.8809],[103.8810, 31.0896]]]

•  wkt数据

点：POINT(103.365926 30.558386)

线：LINESTRING(104.079727 30.540988,104.067608 30.535152)

面：POLYGON ((103.88109322629896 31.089692013481724, 104.01292916379867 30.88919152520053, 103.75200387083044 30.880951779106482, 103.88109322629896 31.089692013481724))

多面：MULTIPOLYGON(((104.4685243069 30.3336904936,104.4670262929 30.33037331,104.4644834911 30.3312774512,104.464433366 30.3313740694,104.4659245068 30.3346309237,104.4685243069 30.3336904936)))

•  点线面数据转为geojson

 turf文档

import * as turf from '@turf/turf';

点转为geojson ：

let point = turf.point([-75.343, 39.984])

geojson point 格式：

 线转为geojson ：turf.lineString([[103.7767, 30.8424],[104.2546, 30.8150],[104.3068, 30.4552]])

面转为geojson ：turf.polygon([[[103.8810, 31.0896],[104.0129, 30.8891],[103.7520, 30.8809],[103.8810, 31.0896]]])

•  geojson与wkt互转

import { stringify, parse } from 'wellknown'; // 坐标转换

stringify：geojson转wkt;

parse：wkt转geojson;