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SubmarineMonitoring/common/plugin/map/ol/v6.12.0/examples/cog-stretch.html

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海底监测与灾害预警系统管理平台界面
2 weeks ago
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'type': 'opt-out',
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if (!this.hasConsented()) {
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if (!this.hasConsented()) {
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
<link rel="stylesheet" href="./css/ol.css" type="text/css">
<link rel="stylesheet" href="./resources/layout.css" type="text/css">
<script src="https://unpkg.com/elm-pep"></script>
<script src="https://cdn.polyfill.io/v3/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="cog-stretch.css">
<title>Band Contrast Stretch</title>
</head>
<body>
<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt="">&nbsp;OpenLayers</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<!-- menu items that get hidden below 768px width -->
<nav class="collapse navbar-collapse" id="olmenu">
<ul class="nav navbar-nav ml-auto">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="docdropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Docs</a>
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<a class="dropdown-item" href="../doc/">Docs</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="../doc/quickstart.html"><i class="fa fa-check fa-fw mr-2 fa-lg"></i>Quick Start</a>
<a class="dropdown-item" href="../doc/faq.html"><i class="fa fa-question fa-fw mr-2 fa-lg"></i>FAQ</a>
<a class="dropdown-item" href="../doc/tutorials/"><i class="fa fa-book fa-fw mr-2 fa-lg"></i>Tutorials</a>
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<a class="nav-link dropdown-toggle" href="#" id="codedropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Code</a>
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<a class="dropdown-item" href="https://github.com/openlayers/openlayers"><i class="fa fa-github fa-fw mr-2 fa-lg"></i>Repository</a>
<a class="dropdown-item" href="/download/"><i class="fa fa-download fa-fw mr-2 fa-lg"></i>Download</a>
</div>
</li>
</ul>
</nav>
</header>
<div class="container-fluid line-numbers">
<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
This example uses OpenLayers v<span>6.12.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
</div>
<div class="row-fluid">
<a href="#" id="codepen-button" class="btn btn-link float-right">
<i class="fa fa-codepen fa-lg"></i> Edit
</a>
<div class="span12">
<h4 id="title">Band Contrast Stretch</h4>
<p class="tags">
<span class="badge-group">
<a
href="./index.html?q=cog" class="badge badge-info">cog</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="cog"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog.html&quot;&gt;Cloud Optimized GeoTIFF (COG)&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-pyramid.html&quot;&gt;GeoTIFF tile pyramid&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-overviews.html&quot;&gt;GeoTIFF with Overviews&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-math.html&quot;&gt;NDVI from a Sentinel 2 COG&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-colors.html&quot;&gt;NDVI with a Dynamic Color Ramp&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-math-multisource.html&quot;&gt;NDVI+NDWI from two 16-bit COGs&lt;/a&gt;"
tabindex="0"
>8</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=webgl" class="badge badge-info">webgl</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="webgl"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-layer-swipe.html&quot;&gt;Layer Swipe (WebGL)&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./numpytile.html&quot;&gt;Rendering 16-bit NumpyTiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-sea-level.html&quot;&gt;Sea Level (with WebGL)&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-shaded-relief.html&quot;&gt;Shaded Relief (with WebGL)&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tile-style.html&quot;&gt;WebGL Tile Layer Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tiles.html&quot;&gt;WebGL Tiles&lt;/a&gt;"
tabindex="0"
>12</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=style" class="badge badge-info">style</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="style"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./animated-gif.html&quot;&gt;Animated GIF&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./polygon-styles.html&quot;&gt;Custom Polygon Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./clusters-dynamic.html&quot;&gt;Dynamic clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-clusters.html&quot;&gt;Earthquake Clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-earthquakes.html&quot;&gt;Earthquakes in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-custom-symbol.html&quot;&gt;Earthquakes with custom symbols&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-color.html&quot;&gt;Icon Colors&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-scale.html&quot;&gt;Icon Scale&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./measure-style.html&quot;&gt;Measure using vector styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./regularshape.html&quot;&gt;Regular Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./style-renderer.html&quot;&gt;Style renderer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./canvas-gradient-pattern.html&quot;&gt;Styling feature with CanvasGradient or CanvasPattern&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-timezones.html&quot;&gt;Timezones in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topojson.html&quot;&gt;TopoJSON&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tile-style.html&quot;&gt;WebGL Tile Layer Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wind-arrows.html&quot;&gt;Wind Arrows&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./zoomslider.html&quot;&gt;Zoom Sliders&lt;/a&gt;"
tabindex="0"
>22</a>
</span>
</p>
<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
<div class="modal-dialog modal-dialog-scrollable" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="tag-example-title"></h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">&times;</span>
</button>
</div>
<div class="modal-body">
<div class="list-group"></div>
</div>
</div>
</div>
</div>
<div id="map" class="map"></div>
<div class="controls">
<label for="red">Red channel</label>
<select id="red">
<option value="1" selected>visible red</option>
<option value="2">visible green</option>
<option value="3">visible blue</option>
<option value="4">near infrared</option>
</select>
<label>max
<input type="range" id="redMax" value="3000" min="2000" max="5000">
</label>
<label for="green">Green channel</label>
<select id="green">
<option value="1">visible red</option>
<option value="2" selected>visible green</option>
<option value="3">visible blue</option>
<option value="4">near infrared</option>
</select>
<label>max
<input type="range" id="greenMax" value="3000" min="2000" max="5000">
</label>
<label for="blue">Blue channel</label>
<select id="blue">
<option value="1">visible red</option>
<option value="2">visible green</option>
<option value="3" selected>visible blue</option>
<option value="4">near infrared</option>
</select>
<label>max
<input type="range" id="blueMax" value="3000" min="2000" max="5000">
</label>
</div>
</div>
<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
<input id="codesandbox-params" type="hidden" name="parameters">
</form>
</div>
<div class="row-fluid">
<div class="span12">
<p id="shortdesc">Choosing bands and applying contrast stretch</p>
<div id="docs"><p>This example uses the <code>layer.updateStyleVariables()</code> method to update the rendering of a GeoTIFF based on user selected bands and contrast stretch parameters.</p>
</div>
</div>
</div>
<div class="row-fluid">
<h5 class="source-heading">main.js</h5>
<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import GeoTIFF from &#x27;ol/source/GeoTIFF&#x27;;
import Map from &#x27;ol/Map&#x27;;
import TileLayer from &#x27;ol/layer/WebGLTile&#x27;;
import View from &#x27;ol/View&#x27;;
const channels &#x3D; [&#x27;red&#x27;, &#x27;green&#x27;, &#x27;blue&#x27;];
for (const channel of channels) {
const selector &#x3D; document.getElementById(channel);
selector.addEventListener(&#x27;change&#x27;, update);
const input &#x3D; document.getElementById(&#x60;${channel}Max&#x60;);
input.addEventListener(&#x27;input&#x27;, update);
}
function getVariables() {
const variables &#x3D; {};
for (const channel of channels) {
const selector &#x3D; document.getElementById(channel);
variables[channel] &#x3D; parseInt(selector.value, 10);
const inputId &#x3D; &#x60;${channel}Max&#x60;;
const input &#x3D; document.getElementById(inputId);
variables[inputId] &#x3D; parseInt(input.value, 10);
}
return variables;
}
const layer &#x3D; new TileLayer({
style: {
variables: getVariables(),
color: [
&#x27;array&#x27;,
[&#x27;/&#x27;, [&#x27;band&#x27;, [&#x27;var&#x27;, &#x27;red&#x27;]], [&#x27;var&#x27;, &#x27;redMax&#x27;]],
[&#x27;/&#x27;, [&#x27;band&#x27;, [&#x27;var&#x27;, &#x27;green&#x27;]], [&#x27;var&#x27;, &#x27;greenMax&#x27;]],
[&#x27;/&#x27;, [&#x27;band&#x27;, [&#x27;var&#x27;, &#x27;blue&#x27;]], [&#x27;var&#x27;, &#x27;blueMax&#x27;]],
1,
],
},
source: new GeoTIFF({
normalize: false,
sources: [
{
url: &#x27;https://s2downloads.eox.at/demo/EOxCloudless/2020/rgbnir/s2cloudless2020-16bits_sinlge-file_z0-4.tif&#x27;,
},
],
}),
});
function update() {
layer.updateStyleVariables(getVariables());
}
const map &#x3D; new Map({
target: &#x27;map&#x27;,
layers: [layer],
view: new View({
projection: &#x27;EPSG:4326&#x27;,
center: [0, 0],
zoom: 2,
maxZoom: 6,
}),
});
</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">index.html</h5>
<pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
&lt;meta charset="UTF-8"&gt;
&lt;title&gt;Band Contrast Stretch&lt;/title&gt;
&lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
&lt;script src="https://unpkg.com/elm-pep"&gt;&lt;/script&gt;
&lt;!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x --&gt;
&lt;script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"&gt;&lt;/script&gt;
&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"&gt;&lt;/script&gt;
&lt;style&gt;
.map {
width: 100%;
height:400px;
}
.controls {
display: grid;
grid-template-columns: auto auto 1fr;
align-items: baseline;
gap: 0 1em;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;div class&#x3D;&quot;controls&quot;&gt;
&lt;label for&#x3D;&quot;red&quot;&gt;Red channel&lt;/label&gt;
&lt;select id&#x3D;&quot;red&quot;&gt;
&lt;option value&#x3D;&quot;1&quot; selected&gt;visible red&lt;/option&gt;
&lt;option value&#x3D;&quot;2&quot;&gt;visible green&lt;/option&gt;
&lt;option value&#x3D;&quot;3&quot;&gt;visible blue&lt;/option&gt;
&lt;option value&#x3D;&quot;4&quot;&gt;near infrared&lt;/option&gt;
&lt;/select&gt;
&lt;label&gt;max
&lt;input type&#x3D;&quot;range&quot; id&#x3D;&quot;redMax&quot; value&#x3D;&quot;3000&quot; min&#x3D;&quot;2000&quot; max&#x3D;&quot;5000&quot;&gt;
&lt;/label&gt;
&lt;label for&#x3D;&quot;green&quot;&gt;Green channel&lt;/label&gt;
&lt;select id&#x3D;&quot;green&quot;&gt;
&lt;option value&#x3D;&quot;1&quot;&gt;visible red&lt;/option&gt;
&lt;option value&#x3D;&quot;2&quot; selected&gt;visible green&lt;/option&gt;
&lt;option value&#x3D;&quot;3&quot;&gt;visible blue&lt;/option&gt;
&lt;option value&#x3D;&quot;4&quot;&gt;near infrared&lt;/option&gt;
&lt;/select&gt;
&lt;label&gt;max
&lt;input type&#x3D;&quot;range&quot; id&#x3D;&quot;greenMax&quot; value&#x3D;&quot;3000&quot; min&#x3D;&quot;2000&quot; max&#x3D;&quot;5000&quot;&gt;
&lt;/label&gt;
&lt;label for&#x3D;&quot;blue&quot;&gt;Blue channel&lt;/label&gt;
&lt;select id&#x3D;&quot;blue&quot;&gt;
&lt;option value&#x3D;&quot;1&quot;&gt;visible red&lt;/option&gt;
&lt;option value&#x3D;&quot;2&quot;&gt;visible green&lt;/option&gt;
&lt;option value&#x3D;&quot;3&quot; selected&gt;visible blue&lt;/option&gt;
&lt;option value&#x3D;&quot;4&quot;&gt;near infrared&lt;/option&gt;
&lt;/select&gt;
&lt;label&gt;max
&lt;input type&#x3D;&quot;range&quot; id&#x3D;&quot;blueMax&quot; value&#x3D;&quot;3000&quot; min&#x3D;&quot;2000&quot; max&#x3D;&quot;5000&quot;&gt;
&lt;/label&gt;
&lt;/div&gt;
&lt;script src="main.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">package.json</h5>
<pre><code id="example-pkg-source" class="language-json">{
&quot;name&quot;: &quot;cog-stretch&quot;,
&quot;dependencies&quot;: {
&quot;ol&quot;: &quot;6.12.0&quot;
},
&quot;devDependencies&quot;: {
&quot;parcel&quot;: &quot;^2.0.0&quot;
},
&quot;scripts&quot;: {
&quot;start&quot;: &quot;parcel index.html&quot;,
&quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
}
}</code></pre>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
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