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IGN WMTS

发布于 2022-11-30 23:36:04 字数 3788 浏览 0 评论 0 收藏 0

本示例演示 IGN (法国) WMTS 图层。

在本示例展示 IGN WMTS 图层。更多 IGN's WMTS 服务信息详见 IGN Géoportail API web page 和 Documentation de l’offre de données et services de l’IGN（法语）

main.js

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

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="http://www.wenjiangs.com/wp-content/uploads/2022/docimg28/IGN.gif" title="Institut national de l\'' +
    'information géographique et forestière" alt="IGN"></a>',
});

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

map.addLayer(ign);

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>IGN WMTS</title>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://unpkg.com/elm-pep"></script>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL,TextDecoder,Number.isInteger"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "wmts-ign",
  "dependencies": {
    "ol": "7.1.0"
  },
  "devDependencies": {
    "parcel": "^2.0.0-beta.1"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --public-url . index.html"
  }
}

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