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Cloud Optimized GeoTIFF (COG) from a Blob

发布于 2022-11-30 23:36:02 字数 2667 浏览 0 评论 0 收藏 0

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';
import Map from 'ol/Map';
import TileLayer from 'ol/layer/WebGLTile';

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>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://unpkg.com/elm-pep@1.0.6/dist/elm-pep.js"></script>
    <!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="./resources/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
    <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": "7.1.0"
  },
  "devDependencies": {
    "parcel": "^2.0.0"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --public-url . index.html"
  }
}

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