arcgis json 与 geojson的互转

<script type="text/javascript">
//polygon、mutlipolygon
var arcgisjson = {
"displayFieldName": "",
"fieldAliases": {
"FID": "FID",
"adcode": "adcode",
"name": "name",
},
"geometryType": "esriGeometryPolygon",
"spatialReference": {
"wkid": 4326,
"latestWkid": 4326
},
"fields": [{
"name": "FID",
"type": "esriFieldTypeOID",
"alias": "FID"
},
{
"name": "adcode",
"type": "esriFieldTypeDouble",
"alias": "adcode"
},
{
"name": "name",
"type": "esriFieldTypeString",
"alias": "name",
"length": 254
},
],
"features": [
{
"attributes": {
"FID": 0,
"adcode": 440303,
"name": "罗湖区",
},
"geometry": {
"rings": [
[
[
114.10517299999999,
22.531628000000001
],
[
114.104805,
22.532513000000002
],
[
114.104586,
22.546033000000001
],
[
114.10427900000001,
22.555434999999999
],
[
114.10517299999999,
22.531628000000001
],
],
]
}
},
{
"attributes": {
"FID" : 4,
"adcode" : 440307,
"name" : "龙岗区",
},
"geometry": {
"rings": [
[
[
114.355782,
22.765794
],
[
114.353458,
22.765993999999999
],
[
114.35217799999999,
22.768257999999999
],
[
114.355782,
22.765794
]
],
[
[
114.339294,
22.623358
],
[
114.339899,
22.625447000000001
],
[
114.34240800000001,
22.626605999999999
],
[
114.339294,
22.623358
]
],
]
}
}
]
}
let tempgeojson = Arcgis_jsonToGeojson(arcgisjson)
console.log(JSON.stringify(tempgeojson));
let temparcgisjson = GeojsonToArcgis_json(tempgeojson)
console.log(JSON.stringify(temparcgisjson));
function Arcgis_jsonToGeojson(arcgis_json){
let geojson = {
"type": "FeatureCollection",
"features":null
}
let features = []
arcgis_json.features.forEach(item=>{
let feature = {
"type": "Feature",
"properties": item.attributes,
"geometry": {
"type": "MultiPolygon",
"coordinates":null,
}
}
if(item.geometry.rings.length>1){ //MultiPolygon
feature.geometry.coordinates = item.geometry.rings.map(ring => [ring]);
// let rings = []
// item.geometry.rings.forEach(ring=>{
// rings.push([ring])
// })
// feature.geometry.coordinates = rings
}else{ //polygon
feature.geometry.coordinates = [item.geometry.rings]
}
features.push(feature)
})
geojson.features = features
return geojson
}
function GeojsonToArcgis_json(geo_json){
let arcgis_json = {
"displayFieldName": "",
"fieldAliases": {},
"geometryType": "esriGeometryPolygon",
"spatialReference": {
"wkid": 4326,
"latestWkid": 4326
},
"fields":[],
"features":[]
}
let fieldAliases = {}
let esriFieldTypeOID = null
let fields = []
for(var key in geo_json.features[0].properties){
if(key == "FID" || key=="OBJECTID"){
if(key=="FID"){
esriFieldTypeOID = "FID"
}else if(key=="OBJECTID" && !esriFieldTypeOID){
esriFieldTypeOID = "OBJECTID"
}
}else{
let fieldType = typeof geo_json.features[0].properties[key] === "number" ? "esriFieldTypeDouble" : "esriFieldTypeString";
let field = {
"name": key,
"type": fieldType,
"alias": key
};

if (fieldType === "esriFieldTypeString") {
field.length = 254; // 默认字符串长度
}
fields.push(field);
}
fieldAliases[key] = key
}
fields.unshift({
"name": esriFieldTypeOID,
"type": "esriFieldTypeOID",
"alias": esriFieldTypeOID
})
arcgis_json.fieldAliases = fieldAliases
arcgis_json.fields = fields

//features
let features = []
geo_json.features.forEach(item=>{
let feature = {
"attributes":item.properties,
"geometry":{
"rings":null
}
}
if(item.geometry.coordinates.length>1){ //MultiPolygon
feature.geometry.rings = item.geometry.coordinates.map(ring => ring[0]);
// let rings = []
// item.geometry.coordinates.forEach(ring=>{
// rings.push(ring[0])
// })
// feature.geometry.rings = rings
}
else{ //polygon
feature.geometry.rings = item.geometry.coordinates[0]
}
features.push(feature)
})
arcgis_json.features = features
return arcgis_json
}
</script>