介绍
GeoJSON是一种对各种地理数据结构进行编码的格式，基于JSON的地理空间信息数据交换格式。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。
Esri JSON是由Esri公司定义的一种GeoJSON格式的扩展，用于表示地理空间要素及其属性信息。与标准的GeoJSON相比，Esri JSON增加了一些属性和元素，以支持Esri ArcGIS产品族的规范。
转换
terraformer/README.md at main · terraformer-js/terraformer · GitHub
npm install @terraformer/arcgis
EsriJSON转GeoJSON
import {
arcgisToGeoJSON } from "@terraformer/arcgis"
arcgisToGeoJSON({
"x":-122.6764,
"y":45.5165,
"spatialReference": {
"wkid": 4326
}
});
>> {
"type": "Point", "coordinates": [ -122.6764, 45.5165 ] }
GeoJSON转EsriJSON
import {
geojsonToArcGIS } from "@terraformer/arcgis"
geojsonToArcGIS({
"type": "Point",
"coordinates": [45.5165, -122.6764]
})
>> {
"x":-122.6764, "y":45.5165, "spatialReference": {
"wkid": 4326 } }
对比
GeoJSON规范文档：RFC 7946: The GeoJSON Format (rfc-editor.org)
Esri JSON规范文档：Geometry objects—Common Data Types | ArcGIS Developers
要素（Feature）
// GeoJSON
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [125.6, 10.1]
},
"properties": {
"name": "Dinagat Islands"
}
}
// EsriJSON
{
"attributes": {
"OBJECTID": 1,
"Name": "Sample",
"Type": "Building"
},
"geometry": {
"rings": [[[0,0],[0,10],[10,10],[10,0],[0,0]]],
"spatialReference": {
"wkid": 4326 }
}
}
Point（点）
// GeoJSON
"geometry":{
"type":"Point",
"coordinates":[105.380859375,31.57853542647338]
}
// EsriJSON
{
"x": -122.690899,
"y": 45.512296
}
MultiPoint（多点）
// GeoJSON
"geometry":{
"type":"MultiPoint",
"coordinates":[
[105.380859375,31.57853542647338],
[105.580859375,31.52853542647338]
]
}
// EsriJSON
{
"points": [[-122.68,45.50],[-122.70,45.52],[-122.68,45.53]],
"spatialReference": {
"wkid": 4326 }
}
LineString（线）
// GeoJSON - 依次连接点
"geometry":{
"type":"LineString",
"coordinates":[
[105.6005859375,30.65681556429287],
[107.9516601562,31.98944183792288],
[109.3798828125,30.03105542654020],
[107.7978515625,29.93589521337244]
]
}
// EsriJSON
{
"paths": [
[[0,0],[5,5],[10,10]]
],
"spatialReference": {
"wkid": 4326 }
}
MultiLineString（多线）
// GeoJSON
"geometry":{
"type":"MultiLineString",
"coordinates":
[
[
[105.6005859375,30.65681556429287],
[107.9516601569,31.98944183792288],
[109.3798828125,30.03105542654020],
[107.7978515625,29.93589521332444]
],
[
[109.3798828125,30.03105542654020],
[107.1978515625,31.23589521337244]
]
]
}
// EsriJSON
{
"paths": [
[[0,0],[5,5],[10,10]],
[[15,15],[20,25],[30,30]]
],
"spatialReference": {
"wkid": 4326 }
}
Polygon（面）
// GeoJSON
"geometry":{
"type": "Polygon",
"coordinates":
[
[
[100.0, 0.0],
[101.0, 0.0],
[101.0, 1.0],
[100.0, 1.0],
[100.0, 0.0]
]
]
}
// EsriJSON
{
"rings": [
[[0,0],[0,10],[10,10],[10,0],[0,0]]
],
"spatialReference": {
"wkid": 4326 }
}
MultiPolygon（多面）
// GeoJSON
"geometry": {
"type": "MultiPolygon",
"coordinates":
[
[
[
[109.2041015625,30.088107753367257],
[115.02685546875,30.088107753367257],
[115.02685546875,32.7872745269555],
[109.2041015625,32.7872745269555],
[109.2041015625,30.088107753367257]
]
],
[
[
[112.9833984375,26.82407078047018],
[116.69677734375,26.82407078047018],
[116.69677734375,29.036960648558267],
[112.9833984375,29.036960648558267],
[112.9833984375,26.82407078047018]
]
]
]
}
// EsriJSON
（待补充...）