COG with Projection Lookup

cog 14 projection 14 proj4js 6 maptiler 26

Rendering a COG over another layer in a different projection.

Example of using fromEPSGCode() to enable a COG to be rendered over another layer in a different projection.

main.js

import proj4 from 'proj4';
import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/WebGLTile.js';
import {
  epsgLookupMapTiler,
  fromEPSGCode,
  register,
  setEPSGLookup,
} from 'ol/proj/proj4.js';
import GeoTIFF from 'ol/source/GeoTIFF.js';
import XYZ from 'ol/source/XYZ.js';

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>';

register(proj4);
setEPSGLookup(epsgLookupMapTiler(key));

const cogSource = new GeoTIFF({
  sources: [
    {
      url: 'https://mikenunn.net/data/MiniScale_(std_with_grid)_R23.tif',
      nodata: 0,
    },
  ],
});

cogSource.setAttributions(
  'Contains OS data © Crown Copyright and database right ' +
    new Date().getFullYear(),
);

const map = new Map({
  target: 'map',
  layers: [
    new TileLayer({
      source: new XYZ({
        attributions: attributions,
        url:
          'https://api.maptiler.com/maps/satellite/{z}/{x}/{y}.jpg?key=' + key,
        tileSize: 512,
        maxZoom: 20,
        crossOrigin: '',
      }),
      style: {exposure: 0.2},
    }),
    new TileLayer({
      source: cogSource,
      opacity: 0.7,
      style: {gamma: 0.7},
    }),
  ],
  view: cogSource
    .getView()
    .then((viewConfig) =>
      fromEPSGCode(viewConfig.projection.getCode()).then(() => viewConfig),
    ),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>COG with Projection Lookup</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": "cog-projection",
  "dependencies": {
    "ol": "10.4.0",
    "proj4": "2.15.0"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}