如何将来自服务器的普通地理json转换为geoJson?

时间:2019-04-03 13:55:56

标签: javascript react-native mapbox geojson react-native-mapbox-gl

我有一台服务器,其服务器具有标准json格式的地理数据,我需要将其更改为geojson格式,以便Mapbox可以读取它。你怎么做到的?

例如,您如何转换它:

[
  {
    "id": 0,
    "name": "Hotel",
    "icon": "Sleep",
    "address": "SampleStreet 34",
    "latitude": 12,
    "longitude": 55
  }
]

对此:

{
"type": "FeatureCollection",
  "features": [
    {
    "id": 0,
    "type": "Feature",
    "properties": {
      "placeID": 0,
      "name": "Hotel",
      "icon": "sleep",
      "addressFormatted": "SampleStreet 34"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [
        12,
        55
      ]
    }
}

3 个答案:

答案 0 :(得分:0)

有@turf库将对此提供帮助,因此您可以执行以下操作:

import { lineString as makeLineString } from '@turf/helpers';

然后使用它(请注意,经度优先)

var coords = [];
var dataarray = JSON.parse(thejson);
for (var i=0; i < dataarray.length; i++){
    obj = dataarray[i];
    coords.push([obj.long, obj.latitude]);    
}

let mapboxpoints = makeLineString(coords)

您应该在此处查看地图框示例:https://github.com/nitaliano/react-native-mapbox-gl/tree/master/example/src

答案 1 :(得分:0)

我使用了GeoJson(https://www.npmjs.com/package/geojson)来解析我的数据,看起来如下所示的效果很好:

import GeoJSON from 'geojson';
import jsonData from './jsonData.json';

const json = jsonData;

const data = GeoJSON.parse(json, {
  Point: ['latitude', 'longitude'],
  include: ['name', 'icon', 'addressFormatted']
});

export default data;

但是我现在想念的是我的feature.id。有人知道如何将其合并吗?我不希望我的ID位于属性下。

答案 2 :(得分:0)

如果您使用ES6,则类似的方法可能对您有用,如果您可以直接使用生成的对象,则可能不需要JSON.stringify

const data = [
  {
    id: "0",
    name: "Hotel",
    icon: "Sleep",
    address: "SampleStreet 34",
    latitude: "12",
    longitude: "55"
  },
  {
    id: "1",
    name: "Landmark",
    icon: "Star",
    address: "SampleStreet 1234",
    latitude: "99",
    longitude: "100"
  }
];

const geojson = {
  type: "FeatureCollection",
  features: data.map(item => {
    return {
      id: item.id,
      type: "Feature",
      properties: {
        placeID: item.id,
        name: item.name,
        icon: item.icon,
        addressFormatted: item.address
      },
      geometry: {
        type: "Point",
        coordinates: [item.latitude, item.longitude]
      }
    };
  })
};

console.log(geojson);
console.log(JSON.stringify(geojson));