mirror of https://gitee.com/antv-l7/antv-l7
205 lines
3.2 KiB
Markdown
205 lines
3.2 KiB
Markdown
---
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title: GeoJSON
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order: 1
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---
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`markdown:docs/common/style.md`
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## 简介
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GeoJSON 是一种对各种地理数据结构进行编码的格式。GeoJSON 对象可以表示几何、特征或者特征集合。GeoJSON 支持下面几何类型：点、线、面、多点、多线、多面和几何集合。GeoJSON 里的特征包含一个几何对象和其他属性，特征集合表示一系列特征。
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[The GeoJSON Format](https://tools.ietf.org/html/draft-butler-geojson-06)
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L7 数据 source 支持 传入 Geometry 集合 FeatureCollection
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### Feature Collection Object
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一个 feature Colletion 由对个 feature 组成
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```json
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{
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"type": "FeatureCollection",
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"features": [
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{
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"type": "Feature",
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"properties": {
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"name": "tom"
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},
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"geometry": {
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"type": "Polygon",
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"coordinates": [
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[
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[-2.8125, 34.59704151614417],
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[65.390625, 34.59704151614417],
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[65.390625, 61.10078883158897],
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[-2.8125, 61.10078883158897],
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[-2.8125, 34.59704151614417]
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]
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]
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}
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}
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]
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}
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```
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### Feature Object
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一个 feature 有 geometry 空间信息，properties 属性信息，其中 geometry 是必须字段
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```json
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{
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"type": "Feature",
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"properties": {},
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"geometry": {}
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}
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```
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### Gemetry Object
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支持 Gemetry Object 类型
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#### Point
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```json
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{
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"type": "Point",
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"coordinates": [100.0, 0.0]
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}
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```
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#### MultiPoint
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```json
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{
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"type": "MultiPoint",
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"coordinates": [
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[100.0, 0.0],
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[101.0, 1.0]
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]
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}
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```
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Line
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#### LineSring
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```json
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{
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"type": "LineString",
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"coordinates": [
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[100.0, 0.0],
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[101.0, 1.0]
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]
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}
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```
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#### MultiLineString
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```json
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{
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"type": "MultiLineString",
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"coordinates": [
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[
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[100.0, 0.0],
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[101.0, 1.0]
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],
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[
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[102.0, 2.0],
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[103.0, 3.0]
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]
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]
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}
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```
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Polygon
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#### Polygon
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```json
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{
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"type": "Polygon",
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"coordinates": [
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[
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[100.0, 0.0],
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[101.0, 0.0],
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[101.0, 1.0],
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[100.0, 1.0],
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[100.0, 0.0]
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]
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]
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}
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```
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With holes:
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```json
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{
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"type": "Polygon",
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"coordinates": [
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[
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[-170.0, 10.0],
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[170.0, 10.0],
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[170.0, -10.0],
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[-170.0, -10.0],
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[-170.0, 10.0]
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],
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[
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[175.0, 5.0],
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[-175.0, 5.0],
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[-175.0, -5.0],
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[175.0, -5.0],
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[175.0, 5.0]
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]
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]
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}
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```
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#### MultiPolygon
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```json
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{
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"type": "MultiPolygon",
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"coordinates": [
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[
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[
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[102.0, 2.0],
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[103.0, 2.0],
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[103.0, 3.0],
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[102.0, 3.0],
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[102.0, 2.0]
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]
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],
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[
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[
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[100.0, 0.0],
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[101.0, 0.0],
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[101.0, 1.0],
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[100.0, 1.0],
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[100.0, 0.0]
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],
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[
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[100.2, 0.2],
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[100.8, 0.2],
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[100.8, 0.8],
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[100.2, 0.8],
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[100.2, 0.2]
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]
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]
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]
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}
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```
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[geojson 详细文档]()
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## Geojson 相关的 JS 库
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### 地理统计分析工具
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[turfjs](http://turfjs.org/): 地理数据计算，处理，统计，分析的 Javascript 库
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### 在线工具：
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[http://geojson.io/](http://geojson.io/) 可以在线查看，绘制，修改 GeoJSON 数据
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[https://mapshaper.org/](https://mapshaper.org/) 可以查看较大的 geojson，还能够简化 GeoJSON 数据
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