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421 lines
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421 lines
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<h4 id="title">Rendering 16-bit NumpyTiles</h4>
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<p class="tags">
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<span class="badge-group">
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href="./index.html?q=numpytiles" class="badge badge-info">numpytiles</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="numpytiles"
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data-content="
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<a class="list-group-item list-group-item-action active" href="./numpytile.html">Rendering 16-bit NumpyTiles</a>"
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tabindex="0"
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>1</a>
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</span>
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<span class="badge-group">
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<a
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href="./index.html?q=webgl" class="badge badge-info">webgl</a
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><a
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class="badge badge-info tag-modal-toggle text-white"
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data-toggle="modal"
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data-target="#tag-example-list"
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data-title="webgl"
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data-content="
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<a class="list-group-item list-group-item-action" href="./cog-stretch.html">Band Contrast Stretch</a>
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<a class="list-group-item list-group-item-action" href="./cog-style.html">Change Tile Layer Style</a>
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<a class="list-group-item list-group-item-action" href="./heatmap-earthquakes.html">Earthquakes Heatmap</a>
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<a class="list-group-item list-group-item-action" href="./filter-points-webgl.html">Filtering features with WebGL</a>
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<a class="list-group-item list-group-item-action" href="./icon-sprite-webgl.html">Icon Sprites with WebGL</a>
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<a class="list-group-item list-group-item-action" href="./webgl-layer-swipe.html">Layer Swipe (WebGL)</a>
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<a class="list-group-item list-group-item-action active" href="./numpytile.html">Rendering 16-bit NumpyTiles</a>
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<a class="list-group-item list-group-item-action" href="./webgl-sea-level.html">Sea Level (with WebGL)</a>
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<a class="list-group-item list-group-item-action" href="./webgl-shaded-relief.html">Shaded Relief (with WebGL)</a>
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<a class="list-group-item list-group-item-action" href="./webgl-points-layer.html">WebGL points layer</a>
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<a class="list-group-item list-group-item-action" href="./webgl-tile-style.html">WebGL Tile Layer Styles</a>
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<a class="list-group-item list-group-item-action" href="./webgl-tiles.html">WebGL Tiles</a>"
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tabindex="0"
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>12</a>
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</span>
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</p>
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<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
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<div class="modal-dialog modal-dialog-scrollable" role="document">
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<div class="modal-content">
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<div class="modal-header">
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<h5 class="modal-title" id="tag-example-title"></h5>
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<button type="button" class="close" data-dismiss="modal" aria-label="Close">
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<span aria-hidden="true">×</span>
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</button>
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<div class="modal-body">
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<div class="list-group"></div>
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</div>
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</div>
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</div>
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</div>
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<div id="map" class="map"></div>
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<div>
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<h5>Contrast stretch</h5>
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<ul>
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<li>Min <input type="range" min="1000" max="10000" id="input-min"/> <span id="output-min"></span></li>
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<li>Max <input type="range" min="10000" max="50000" id="input-max"/> <span id="output-max"></span></li>
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</ul>
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</div>
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</div>
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<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
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<input id="codesandbox-params" type="hidden" name="parameters">
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</form>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<p id="shortdesc">Renders a multi-byte depth source image directly using WebGL.</p>
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<div id="docs"><p>This example uses a <code>ol/source/DataTile</code> source to load multi-byte raster data in the <a href="https://github.com/planetlabs/numpytiles-spec/">NumpyTile</a> format. The source is rendered with a <code>ol/layer/WebGLTile</code> layer. Adjusting the sliders above performs a contrast stretch by adjusting the style variables set on the layer.</p>
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</div>
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</div>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">main.js</h5>
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<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
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import DataTileSource from 'ol/source/DataTile';
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import Map from 'ol/Map';
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import TileLayer from 'ol/layer/WebGLTile';
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import View from 'ol/View';
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import {fromLonLat} from 'ol/proj';
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// 16-bit COG
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// Which will be served as NumpyTiles.
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const COG =
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'https://storage.googleapis.com/open-cogs/stac-examples/20201211_223832_CS2_analytic.tif';
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function numpyTileLoader(z, x, y) {
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const url = `https://api.cogeo.xyz/cog/tiles/WebMercatorQuad/${z}/${x}/${y}@1x?format=npy&url=${encodeURIComponent(
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COG
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)}`;
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return fetch(url)
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.then((r) => r.arrayBuffer())
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.then((buffer) => NumpyLoader.fromArrayBuffer(buffer))
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.then((numpyData) => {
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// flatten the numpy data
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const dataTile = new Float32Array(256 * 256 * 5);
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const bandSize = 256 * 256;
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for (let x = 0; x < 256; x++) {
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for (let y = 0; y < 256; y++) {
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const px = x + y * 256;
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dataTile[px * 5 + 0] = numpyData.data[y * 256 + x];
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dataTile[px * 5 + 1] = numpyData.data[bandSize + y * 256 + x];
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dataTile[px * 5 + 2] = numpyData.data[bandSize * 2 + y * 256 + x];
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dataTile[px * 5 + 3] = numpyData.data[bandSize * 3 + y * 256 + x];
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dataTile[px * 5 + 4] =
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numpyData.data[bandSize * 4 + y * 256 + x] > 0 ? 1.0 : 0;
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}
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}
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return dataTile;
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});
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}
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const interpolateBand = (bandIdx) => [
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'interpolate',
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['linear'],
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['band', bandIdx],
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['var', 'bMin'],
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0,
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['var', 'bMax'],
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1,
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];
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const initialMin = 3000;
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const initialMax = 18000;
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const numpyLayer = new TileLayer({
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style: {
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color: [
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'array',
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interpolateBand(3),
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interpolateBand(2),
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interpolateBand(1),
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['band', 5],
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],
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variables: {
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'bMin': initialMin,
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'bMax': initialMax,
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},
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},
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source: new DataTileSource({
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loader: numpyTileLoader,
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bandCount: 5,
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}),
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});
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const map = new Map({
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target: 'map',
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layers: [numpyLayer],
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view: new View({
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center: fromLonLat([172.933, 1.3567]),
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zoom: 15,
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}),
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});
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const inputMin = document.getElementById('input-min');
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const inputMax = document.getElementById('input-max');
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const outputMin = document.getElementById('output-min');
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const outputMax = document.getElementById('output-max');
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const handleMin = (evt) => {
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numpyLayer.updateStyleVariables({
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'bMin': parseFloat(evt.target.value),
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'bMax': parseFloat(inputMax.value),
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});
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outputMin.innerText = evt.target.value;
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};
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inputMin.addEventListener('input', handleMin);
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inputMin.addEventListener('change', handleMin);
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const handleMax = (evt) => {
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numpyLayer.updateStyleVariables({
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'bMin': parseFloat(inputMin.value),
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'bMax': parseFloat(evt.target.value),
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});
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outputMax.innerText = evt.target.value;
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};
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inputMax.addEventListener('input', handleMax);
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inputMax.addEventListener('change', handleMax);
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inputMin.value = initialMin;
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inputMax.value = initialMax;
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outputMin.innerText = initialMin;
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outputMax.innerText = initialMax;
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</code></pre>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">index.html</h5>
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<pre><code id="example-html-source" class="language-markup"><!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Rendering 16-bit NumpyTiles</title>
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|
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
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<script src="https://unpkg.com/elm-pep"></script>
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|
<!-- The lines below are 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,TextDecoder"></script>
|
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<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
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<script src="https://unpkg.com/@planet/ol-numpytiles@2.0.2/umd/NumpyLoader.js"></script>
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<style>
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.map {
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width: 100%;
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height:400px;
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}
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input[type="range"] {
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vertical-align: text-bottom;
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}
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</style>
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</head>
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<body>
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<div id="map" class="map"></div>
|
|
|
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<div>
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<h5>Contrast stretch</h5>
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<ul>
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<li>Min <input type="range" min="1000" max="10000" id="input-min"/> <span id="output-min"></span></li>
|
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<li>Max <input type="range" min="10000" max="50000" id="input-max"/> <span id="output-max"></span></li>
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</ul>
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</div>
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<script src="main.js"></script>
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</body>
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</html></code></pre>
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</div>
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<div class="row-fluid">
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<h5 class="source-heading">package.json</h5>
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<pre><code id="example-pkg-source" class="language-json">{
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"name": "numpytile",
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"dependencies": {
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"ol": "6.12.0"
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},
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"devDependencies": {
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"parcel": "^2.0.0"
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},
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"scripts": {
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"start": "parcel index.html",
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"build": "parcel build --public-url . index.html"
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}
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}</code></pre>
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</div>
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</div>
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<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
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|
<script src="./resources/prism/prism-1.20.0.min.js"></script>
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<script src="./resources/common.js"></script>
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<script src="common.js"></script>
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<script src="numpytile.js"></script>
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<script>
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$('#tag-example-list').on('show.bs.modal', function (event) {
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const button = $(event.relatedTarget); // Button that triggered the modal
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const title = button.data('title');
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const content = button.data('content');
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const modal = $(this)
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modal.find('.modal-title').text(title);
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modal.find('.modal-body').html(content);
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});
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var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
|
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fetch(packageUrl).then(function(response) {
|
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return response.json();
|
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}).then(function(json) {
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var latestVersion = json.version;
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document.getElementById('latest-version').innerHTML = latestVersion;
|
|
var url = window.location.href;
|
|
var branchSearch = url.match(/\/([^\/]*)\/examples\//);
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var cookieText = 'dismissed=-' + latestVersion + '-';
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var dismissed = document.cookie.indexOf(cookieText) != -1;
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if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.12.0' != latestVersion) {
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var link = url.replace(branchSearch[0], '/latest/examples/');
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fetch(link, {method: 'head'}).then(function(response) {
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var a = document.getElementById('latest-link');
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a.href = response.status == 200 ? link : '../../latest/examples/';
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});
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var latestCheck = document.getElementById('latest-check');
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latestCheck.style.display = '';
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document.getElementById('latest-dismiss').onclick = function() {
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latestCheck.style.display = 'none';
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document.cookie = cookieText;
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}
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|
}
|
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});
|
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</script>
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</body>
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</html>
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