WFS with geographic coordinates

geographic 4 vector 82 WFS 3 tile 9 strategy 2 loading 8 server 5 maptiler 26

Example of using WFS with a Tile strategy.

This example loads new features from GeoServer WFS with a tile based loading strategy. Calling the useGeographic function in the 'ol/proj' module makes it so the map view uses geographic coordinates (even if the view projection is not geographic).

main.js

import Map from 'ol/Map.js';
import View from 'ol/View.js';
import GeoJSON from 'ol/format/GeoJSON.js';
import TileLayer from 'ol/layer/Tile.js';
import VectorLayer from 'ol/layer/Vector.js';
import {tile} from 'ol/loadingstrategy.js';
import {useGeographic} from 'ol/proj.js';
import ImageTile from 'ol/source/ImageTile.js';
import VectorSource from 'ol/source/Vector.js';
import Stroke from 'ol/style/Stroke.js';
import Style from 'ol/style/Style.js';
import {createXYZ} from 'ol/tilegrid.js';

useGeographic();

const vectorSource = new VectorSource({
  format: new GeoJSON(),
  url: function (extent) {
    return (
      'https://ahocevar.com/geoserver/wfs?service=WFS&' +
      'version=1.1.0&request=GetFeature&typename=osm:water_areas&' +
      'outputFormat=application/json&srsname=EPSG:4326&' +
      'bbox=' +
      extent.join(',') +
      ',EPSG:4326'
    );
  },
  strategy: tile(createXYZ({tileSize: 512})),
});

const vector = new VectorLayer({
  source: vectorSource,
  style: new Style({
    stroke: new Stroke({
      color: 'rgba(0, 0, 255, 1.0)',
      width: 2,
    }),
  }),
});

const key = 'Get your own API key at https://www.maptiler.com/cloud/';
const attributions =
  '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
  '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';

const raster = new TileLayer({
  source: new ImageTile({
    attributions: attributions,
    url: 'https://api.maptiler.com/maps/satellite/{z}/{x}/{y}.jpg?key=' + key,
    tileSize: 512,
    maxZoom: 20,
  }),
});

const map = new Map({
  layers: [raster, vector],
  target: document.getElementById('map'),
  view: new View({
    center: [-80.0298, 43.4578],
    maxZoom: 19,
    zoom: 12,
  }),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>WFS with geographic coordinates</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>

    <script type="module" src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "vector-wfs-geographic",
  "dependencies": {
    "ol": "10.5.0"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}