Cloud Optimized GeoTIFF (COG) from a Blob

Rendering a COG as a tiled layer from a Blob.

Tiled data from a Cloud Optimized GeoTIFF (COG) can be rendered as a layer. In this example, a single 3-band GeoTIFF is used to render RGB data from a Blob.

main.js

import GeoTIFF from 'ol/source/GeoTIFF.js';
import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/WebGLTile.js';

fetch('data/example.tif')
  .then((response) => response.blob())
  .then((blob) => {
    const source = new GeoTIFF({
      sources: [
        {
          blob: blob,
        },
      ],
    });

    const map = new Map({
      target: 'map',
      layers: [
        new TileLayer({
          source: source,
        }),
      ],
      view: source.getView().then((viewConfig) => {
        viewConfig.showFullExtent = true;
        return viewConfig;
      }),
    });
  });

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Cloud Optimized GeoTIFF (COG) from a Blob</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-blob",
  "dependencies": {
    "ol": "10.2.1"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}