---
title: "Javascript Shapefile/kml/geojson 转换"
title-en: "Javascript Shapefile/kml/geojson Conversion"
tags: ["spatial", "gis", "data format"]
categories: ["shares"]
pubDate: "2021-01-16T06:23:44.000Z"
isDraft: false
---
## 三个需求
- geojson -> shapefile 并下载
- geojson -> kml 并下载
- Shapefile (zipped) -> geojson
## geojson构建工具
这里选择常用的Javascript的几何计算类库[[turfjs/turf]](https://github.com/Turfjs/turf)
使用cdn引入：
```html
```
或者：
```shell
npm install @turf/turf
```
```javascript
import * as turf from '@turf/turf'
```
以折线为例：
```javascript
let line_string = turf.lineString(
[
[-24, 63, 1],
[-23, 60, 2],
[-25, 65, 3],
[-20, 69, 4]
],
{ name: 'line 1' }
)
let geojson_object = turf.featureCollection([line_string])
```
打印对象如下：
```json
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"name": "line 1"
},
"geometry": {
"type": "LineString",
"coordinates": [
[-24, 63, 1],
[-23, 60, 2],
[-25, 65, 3],
[-20, 69, 4]
]
}
}
]
}
```
## geojson 转 shapefile
使用[[mapbox/shp-write]](https://github.com/mapbox/shp-write)包
使用npm安装：
```shell
npm install --save shp-write
```
或者直接引入，之后直接使用shpwrite变量：
```html