原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/wmts-ign.html

运行界面

本例中显示的是IGN的WMTS图层。有关IGN的WMTS服务的更多信息，请参阅IGN gsamoportail API和Documentation de l’offre de donnsames et services de l’IGN(法文)。

main.js代码如下：

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import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import WMTS from 'ol/source/WMTS.js';
import WMTSTileGrid from 'ol/tilegrid/WMTS.js';
import {fromLonLat, get as getProjection} from 'ol/proj.js';
import {getWidth} from 'ol/extent.js';

const map = new Map({
  target: 'map',
  view: new View({
    zoom: 5,
    center: fromLonLat([5, 45]),
  }),
});

const resolutions = [];
const matrixIds = [];
const proj3857 = getProjection('EPSG:3857');
const maxResolution = getWidth(proj3857.getExtent()) / 256;

for (let i = 0; i < 20; i++) {
  matrixIds[i] = i.toString();
  resolutions[i] = maxResolution / Math.pow(2, i);
}

const tileGrid = new WMTSTileGrid({
  origin: [-20037508, 20037508],
  resolutions: resolutions,
  matrixIds: matrixIds,
});

// For more information about the IGN API key see
// https://geoservices.ign.fr/blog/2021/01/29/Maj_Cles_Geoservices.html

const ign_source = new WMTS({
  url: 'https://wxs.ign.fr/choisirgeoportail/geoportail/wmts',
  layer: 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2',
  matrixSet: 'PM',
  format: 'image/png',
  projection: 'EPSG:3857',
  tileGrid: tileGrid,
  style: 'normal',
  attributions:
    '<a href="https://www.ign.fr/" target="_blank">' +
    '<img src="https://wxs.ign.fr/static/logos/IGN/IGN.gif" title="Institut national de l\'' +
    'information géographique et forestière" alt="IGN"></a>',
});

const ign = new TileLayer({
  source: ign_source,
});

map.addLayer(ign);

界面布局文件index.html代码如下：

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>IGN WMTS</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>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://cdn.jsdelivr.net/npm/elm-pep@1.0.6/dist/elm-pep.js"></script>
    <script type="module" src="main.js"></script>
  </body>
</html>