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Image Reprojection

Demonstrates client-side reprojection of single image source.

This example shows client-side reprojection of single image source.

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index.html<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Image Reprojection</title>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="index.js"></script>
  </body>
</html>
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index.jsimport 'ol/ol.css';
import Map from 'ol/Map';
import View from 'ol/View';
import {getCenter} from 'ol/extent';
import {Image as ImageLayer, Tile as TileLayer} from 'ol/layer';
import {transform} from 'ol/proj';
import Static from 'ol/source/ImageStatic';
import OSM from 'ol/source/OSM';
import {register} from 'ol/proj/proj4';
import proj4 from 'proj4';

proj4.defs('EPSG:27700', '+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 ' +
    '+x_0=400000 +y_0=-100000 +ellps=airy ' +
    '+towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 ' +
    '+units=m +no_defs');
register(proj4);

var imageExtent = [0, 0, 700000, 1300000];

var map = new Map({
  layers: [
    new TileLayer({
      source: new OSM()
    }),
    new ImageLayer({
      source: new Static({
        url: 'https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/' +
               'British_National_Grid.svg/2000px-British_National_Grid.svg.png',
        crossOrigin: '',
        projection: 'EPSG:27700',
        imageExtent: imageExtent
      })
    })
  ],
  target: 'map',
  view: new View({
    center: transform(getCenter(imageExtent), 'EPSG:27700', 'EPSG:3857'),
    zoom: 4
  })
});
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package.json{
  "name": "reprojection-image",
  "dependencies": {
    "ol": "6.1.1",
    "proj4": "2.5.0"
  },
  "devDependencies": {
    "parcel": "1.11.0"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --experimental-scope-hoisting --public-url . index.html"
  }
}