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523 lines
22 KiB
HTML
523 lines
22 KiB
HTML
2 weeks ago
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<!DOCTYPE html>
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<html lang="en-US">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=Edge">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<script>
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var gaProperty = 'UA-2577926-1';
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// Disable tracking if the opt-out cookie exists.
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var disableStr = 'ga-disable-' + gaProperty;
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if (document.cookie.indexOf(disableStr + '=true') > -1) {
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window[disableStr] = true;
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}
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function gaOptout() {
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document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
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window[disableStr] = true;
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function gaOptoutRevoke() {
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document.cookie = disableStr + '=false; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
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window[disableStr] = false;
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}
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</script>
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<!-- Global site tag (gtag.js) - Google Analytics -->
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<script async src="https://www.googletagmanager.com/gtag/js?id=UA-2577926-1"></script>
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<script>
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window.dataLayer = window.dataLayer || [];
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function gtag(){dataLayer.push(arguments);}
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gtag('js', new Date());
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gtag('config', 'UA-2577926-1', { 'anonymize_ip': true });
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</script>
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<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css" />
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<script src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.js"></script>
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<script src="https://unpkg.com/lz-string@1.4.4/libs/lz-string.min.js"></script>
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<script>
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window.addEventListener("load", function() {
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window.cookieconsent.initialise({
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'palette': {
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'popup': {
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'background': '#eaf7f7',
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'text': '#5c7291'
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},
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'button': {
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'background': '#56cbdb',
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'text': '#ffffff'
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}
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},
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'theme': 'edgeless',
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'type': 'opt-out',
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'onInitialise': function (status) {
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if (!this.hasConsented()) {
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gaOptout()
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}
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},
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'onStatusChange': function(status, chosenBefore) {
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if (!this.hasConsented()) {
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gaOptout()
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}
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},
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'onRevokeChoice': function() {
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gaOptoutRevoke()
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}
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})
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});
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</script>
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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">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
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<link rel="stylesheet" href="./css/ol.css" type="text/css">
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<link rel="stylesheet" href="./resources/layout.css" type="text/css">
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<script src="https://unpkg.com/elm-pep"></script>
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<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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<link rel="stylesheet" href="shaded-relief.css">
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<title>Shaded Relief</title>
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</head>
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<body>
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<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
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<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt=""> OpenLayers</a>
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<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
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<span class="navbar-toggler-icon"></span>
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</button>
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<!-- menu items that get hidden below 768px width -->
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<nav class="collapse navbar-collapse" id="olmenu">
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<ul class="nav navbar-nav ml-auto">
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<li class="nav-item dropdown">
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<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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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="docdropdown">
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<a class="dropdown-item" href="../doc/">Docs</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="../doc/quickstart.html"><i class="fa fa-check fa-fw mr-2 fa-lg"></i>Quick Start</a>
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<a class="dropdown-item" href="../doc/faq.html"><i class="fa fa-question fa-fw mr-2 fa-lg"></i>FAQ</a>
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<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="dropdown-item" href="/workshop/"><i class="fa fa-graduation-cap fa-fw mr-2 fa-lg"></i>Workshop</a>
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<div class="dropdown-divider"></div>
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<a class="dropdown-item" href="https://stackoverflow.com/questions/tagged/openlayers"><i class="fa fa-stack-overflow fa-fw mr-2"></i>Ask a Question</a>
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</div>
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</li>
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<li class="nav-item active"><a class="nav-link" href="../examples/">Examples</a></li>
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<li class="nav-item"><a class="nav-link" href="../apidoc/"><i class="fa fa-sitemap mr-1"></i>API</a></li>
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<li class="nav-item dropdown">
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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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<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="codedropdown">
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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>
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<a class="dropdown-item" href="/download/"><i class="fa fa-download fa-fw mr-2 fa-lg"></i>Download</a>
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</div>
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</li>
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</ul>
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</nav>
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</header>
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<div class="container-fluid line-numbers">
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<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
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<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
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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>.
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</div>
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<div class="row-fluid">
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<a href="#" id="codepen-button" class="btn btn-link float-right">
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<i class="fa fa-codepen fa-lg"></i> Edit
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</a>
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<div class="span12">
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<h4 id="title">Shaded Relief</h4>
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<p class="tags">
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<span class="badge-group">
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<a
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href="./index.html?q=raster" class="badge badge-info">raster</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="raster"
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data-content="
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<a class="list-group-item list-group-item-action" href="./raster.html">Raster Source</a>
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<a class="list-group-item list-group-item-action" href="./region-growing.html">Region Growing</a>
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<a class="list-group-item list-group-item-action" href="./sea-level.html">Sea Level</a>
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<a class="list-group-item list-group-item-action active" href="./shaded-relief.html">Shaded Relief</a>"
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tabindex="0"
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>4</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=shadedrelief" class="badge badge-info">shadedrelief</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="shadedrelief"
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data-content="
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<a class="list-group-item list-group-item-action active" href="./shaded-relief.html">Shaded Relief</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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tabindex="0"
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>2</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>
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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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<table class="controls">
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<tr>
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<td><label for="vert">vertical exaggeration:</label></td>
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<td><input id="vert" type="range" min="1" max="5" value="1"/></td>
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<td><span id="vertOut"></span> x</td>
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</tr>
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<tr>
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<td><label for="sunEl">sun elevation:</label></td>
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<td><input id="sunEl" type="range" min="0" max="90" value="45"/></td>
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<td><span id="sunElOut"></span> °</td>
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</tr>
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<tr>
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<td><label for="sunAz">sun azimuth:</label></td>
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<td><input id="sunAz" type="range" min="0" max="360" value="45"/></td>
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<td><span id="sunAzOut"></span> °</td>
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</tr>
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</table>
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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">Calculate shaded relief from elevation data</p>
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<div id="docs"><p>
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This example uses a <code>ol/source/Raster</code> to generate data
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based on another source. The raster source accepts any number of
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input sources (tile or image based) and runs a pipeline of
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operations on the input data. The return from the final
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operation is used as the data for the output source.
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</p> <p>
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In this case, a single tiled source of elevation data is used as input.
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The shaded relief is calculated in a single "image" operation. By setting
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<code>operationType: 'image'</code> on the raster source, operations are
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called with an <code>ImageData</code> object for each of the input sources.
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Operations are also called with a general purpose <code>data</code> object.
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In this example, the sun elevation and azimuth data from the inputs above
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are assigned to this <code>data</code> object and accessed in the shading
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operation. The shading operation returns an array of <code>ImageData</code>
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objects. When the raster source is used by an image layer, the first
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<code>ImageData</code> object returned by the last operation in the pipeline
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is used for rendering.
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</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 Map from 'ol/Map';
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import View from 'ol/View';
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import {Image as ImageLayer, Tile as TileLayer} from 'ol/layer';
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import {OSM, Raster, XYZ} from 'ol/source';
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/**
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* Generates a shaded relief image given elevation data. Uses a 3x3
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* neighborhood for determining slope and aspect.
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* @param {Array<ImageData>} inputs Array of input images.
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* @param {Object} data Data added in the "beforeoperations" event.
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* @return {ImageData} Output image.
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*/
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function shade(inputs, data) {
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const elevationImage = inputs[0];
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const width = elevationImage.width;
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const height = elevationImage.height;
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const elevationData = elevationImage.data;
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const shadeData = new Uint8ClampedArray(elevationData.length);
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const dp = data.resolution * 2;
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const maxX = width - 1;
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const maxY = height - 1;
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const pixel = [0, 0, 0, 0];
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const twoPi = 2 * Math.PI;
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const halfPi = Math.PI / 2;
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const sunEl = (Math.PI * data.sunEl) / 180;
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const sunAz = (Math.PI * data.sunAz) / 180;
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const cosSunEl = Math.cos(sunEl);
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const sinSunEl = Math.sin(sunEl);
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let pixelX,
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pixelY,
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x0,
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x1,
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y0,
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y1,
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offset,
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z0,
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z1,
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dzdx,
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dzdy,
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slope,
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aspect,
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cosIncidence,
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scaled;
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function calculateElevation(pixel) {
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// The method used to extract elevations from the DEM.
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// In this case the format used is
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// red + green * 2 + blue * 3
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//
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// Other frequently used methods include the Mapbox format
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// (red * 256 * 256 + green * 256 + blue) * 0.1 - 10000
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// and the Terrarium format
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// (red * 256 + green + blue / 256) - 32768
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//
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return pixel[0] + pixel[1] * 2 + pixel[2] * 3;
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}
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for (pixelY = 0; pixelY <= maxY; ++pixelY) {
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y0 = pixelY === 0 ? 0 : pixelY - 1;
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y1 = pixelY === maxY ? maxY : pixelY + 1;
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for (pixelX = 0; pixelX <= maxX; ++pixelX) {
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x0 = pixelX === 0 ? 0 : pixelX - 1;
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x1 = pixelX === maxX ? maxX : pixelX + 1;
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// determine elevation for (x0, pixelY)
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offset = (pixelY * width + x0) * 4;
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pixel[0] = elevationData[offset];
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pixel[1] = elevationData[offset + 1];
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pixel[2] = elevationData[offset + 2];
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pixel[3] = elevationData[offset + 3];
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z0 = data.vert * calculateElevation(pixel);
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// determine elevation for (x1, pixelY)
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offset = (pixelY * width + x1) * 4;
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pixel[0] = elevationData[offset];
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pixel[1] = elevationData[offset + 1];
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pixel[2] = elevationData[offset + 2];
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pixel[3] = elevationData[offset + 3];
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z1 = data.vert * calculateElevation(pixel);
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dzdx = (z1 - z0) / dp;
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||
|
|
// determine elevation for (pixelX, y0)
|
||
|
|
offset = (y0 * width + pixelX) * 4;
|
||
|
|
pixel[0] = elevationData[offset];
|
||
|
|
pixel[1] = elevationData[offset + 1];
|
||
|
|
pixel[2] = elevationData[offset + 2];
|
||
|
|
pixel[3] = elevationData[offset + 3];
|
||
|
|
z0 = data.vert * calculateElevation(pixel);
|
||
|
|
|
||
|
|
// determine elevation for (pixelX, y1)
|
||
|
|
offset = (y1 * width + pixelX) * 4;
|
||
|
|
pixel[0] = elevationData[offset];
|
||
|
|
pixel[1] = elevationData[offset + 1];
|
||
|
|
pixel[2] = elevationData[offset + 2];
|
||
|
|
pixel[3] = elevationData[offset + 3];
|
||
|
|
z1 = data.vert * calculateElevation(pixel);
|
||
|
|
|
||
|
|
dzdy = (z1 - z0) / dp;
|
||
|
|
|
||
|
|
slope = Math.atan(Math.sqrt(dzdx * dzdx + dzdy * dzdy));
|
||
|
|
|
||
|
|
aspect = Math.atan2(dzdy, -dzdx);
|
||
|
|
if (aspect < 0) {
|
||
|
|
aspect = halfPi - aspect;
|
||
|
|
} else if (aspect > halfPi) {
|
||
|
|
aspect = twoPi - aspect + halfPi;
|
||
|
|
} else {
|
||
|
|
aspect = halfPi - aspect;
|
||
|
|
}
|
||
|
|
|
||
|
|
cosIncidence =
|
||
|
|
sinSunEl * Math.cos(slope) +
|
||
|
|
cosSunEl * Math.sin(slope) * Math.cos(sunAz - aspect);
|
||
|
|
|
||
|
|
offset = (pixelY * width + pixelX) * 4;
|
||
|
|
scaled = 255 * cosIncidence;
|
||
|
|
shadeData[offset] = scaled;
|
||
|
|
shadeData[offset + 1] = scaled;
|
||
|
|
shadeData[offset + 2] = scaled;
|
||
|
|
shadeData[offset + 3] = elevationData[offset + 3];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return {data: shadeData, width: width, height: height};
|
||
|
|
}
|
||
|
|
|
||
|
|
const elevation = new XYZ({
|
||
|
|
url: 'https://{a-d}.tiles.mapbox.com/v3/aj.sf-dem/{z}/{x}/{y}.png',
|
||
|
|
crossOrigin: 'anonymous',
|
||
|
|
});
|
||
|
|
|
||
|
|
const raster = new Raster({
|
||
|
|
sources: [elevation],
|
||
|
|
operationType: 'image',
|
||
|
|
operation: shade,
|
||
|
|
});
|
||
|
|
|
||
|
|
const map = new Map({
|
||
|
|
target: 'map',
|
||
|
|
layers: [
|
||
|
|
new TileLayer({
|
||
|
|
source: new OSM(),
|
||
|
|
}),
|
||
|
|
new ImageLayer({
|
||
|
|
opacity: 0.3,
|
||
|
|
source: raster,
|
||
|
|
}),
|
||
|
|
],
|
||
|
|
view: new View({
|
||
|
|
extent: [-13675026, 4439648, -13580856, 4580292],
|
||
|
|
center: [-13615645, 4497969],
|
||
|
|
minZoom: 10,
|
||
|
|
maxZoom: 16,
|
||
|
|
zoom: 13,
|
||
|
|
}),
|
||
|
|
});
|
||
|
|
|
||
|
|
const controlIds = ['vert', 'sunEl', 'sunAz'];
|
||
|
|
const controls = {};
|
||
|
|
controlIds.forEach(function (id) {
|
||
|
|
const control = document.getElementById(id);
|
||
|
|
const output = document.getElementById(id + 'Out');
|
||
|
|
const listener = function () {
|
||
|
|
output.innerText = control.value;
|
||
|
|
raster.changed();
|
||
|
|
};
|
||
|
|
control.addEventListener('input', listener);
|
||
|
|
control.addEventListener('change', listener);
|
||
|
|
output.innerText = control.value;
|
||
|
|
controls[id] = control;
|
||
|
|
});
|
||
|
|
|
||
|
|
raster.on('beforeoperations', function (event) {
|
||
|
|
// the event.data object will be passed to operations
|
||
|
|
const data = event.data;
|
||
|
|
data.resolution = event.resolution;
|
||
|
|
for (const id in controls) {
|
||
|
|
data[id] = Number(controls[id].value);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
</code></pre>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="row-fluid">
|
||
|
|
<h5 class="source-heading">index.html</h5>
|
||
|
|
<pre><code id="example-html-source" class="language-markup"><!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<meta charset="UTF-8">
|
||
|
|
<title>Shaded Relief</title>
|
||
|
|
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
|
||
|
|
<script src="https://unpkg.com/elm-pep"></script>
|
||
|
|
<!-- 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>
|
||
|
|
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
|
||
|
|
<style>
|
||
|
|
.map {
|
||
|
|
width: 100%;
|
||
|
|
height:400px;
|
||
|
|
}
|
||
|
|
table.controls td {
|
||
|
|
padding: 2px 5px;
|
||
|
|
}
|
||
|
|
table.controls td:nth-child(3) {
|
||
|
|
text-align: right;
|
||
|
|
min-width: 3em;
|
||
|
|
}
|
||
|
|
</style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div id="map" class="map"></div>
|
||
|
|
<table class="controls">
|
||
|
|
<tr>
|
||
|
|
<td><label for="vert">vertical exaggeration:</label></td>
|
||
|
|
<td><input id="vert" type="range" min="1" max="5" value="1"/></td>
|
||
|
|
<td><span id="vertOut"></span> x</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><label for="sunEl">sun elevation:</label></td>
|
||
|
|
<td><input id="sunEl" type="range" min="0" max="90" value="45"/></td>
|
||
|
|
<td><span id="sunElOut"></span> °</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><label for="sunAz">sun azimuth:</label></td>
|
||
|
|
<td><input id="sunAz" type="range" min="0" max="360" value="45"/></td>
|
||
|
|
<td><span id="sunAzOut"></span> °</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<script src="main.js"></script>
|
||
|
|
</body>
|
||
|
|
</html></code></pre>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="row-fluid">
|
||
|
|
<h5 class="source-heading">package.json</h5>
|
||
|
|
<pre><code id="example-pkg-source" class="language-json">{
|
||
|
|
"name": "shaded-relief",
|
||
|
|
"dependencies": {
|
||
|
|
"ol": "6.12.0"
|
||
|
|
},
|
||
|
|
"devDependencies": {
|
||
|
|
"parcel": "^2.0.0"
|
||
|
|
},
|
||
|
|
"scripts": {
|
||
|
|
"start": "parcel index.html",
|
||
|
|
"build": "parcel build --public-url . index.html"
|
||
|
|
}
|
||
|
|
}</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>
|
||
|
|
<script src="./resources/prism/prism-1.20.0.min.js"></script>
|
||
|
|
<script src="./resources/common.js"></script>
|
||
|
|
<script src="common.js"></script>
|
||
|
|
<script src="shaded-relief.js"></script>
|
||
|
|
<script>
|
||
|
|
$('#tag-example-list').on('show.bs.modal', function (event) {
|
||
|
|
const button = $(event.relatedTarget); // Button that triggered the modal
|
||
|
|
const title = button.data('title');
|
||
|
|
const content = button.data('content');
|
||
|
|
const modal = $(this)
|
||
|
|
modal.find('.modal-title').text(title);
|
||
|
|
modal.find('.modal-body').html(content);
|
||
|
|
});
|
||
|
|
|
||
|
|
var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
|
||
|
|
fetch(packageUrl).then(function(response) {
|
||
|
|
return response.json();
|
||
|
|
}).then(function(json) {
|
||
|
|
var latestVersion = json.version;
|
||
|
|
document.getElementById('latest-version').innerHTML = latestVersion;
|
||
|
|
var url = window.location.href;
|
||
|
|
var branchSearch = url.match(/\/([^\/]*)\/examples\//);
|
||
|
|
var cookieText = 'dismissed=-' + latestVersion + '-';
|
||
|
|
var dismissed = document.cookie.indexOf(cookieText) != -1;
|
||
|
|
if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.12.0' != latestVersion) {
|
||
|
|
var link = url.replace(branchSearch[0], '/latest/examples/');
|
||
|
|
fetch(link, {method: 'head'}).then(function(response) {
|
||
|
|
var a = document.getElementById('latest-link');
|
||
|
|
a.href = response.status == 200 ? link : '../../latest/examples/';
|
||
|
|
});
|
||
|
|
var latestCheck = document.getElementById('latest-check');
|
||
|
|
latestCheck.style.display = '';
|
||
|
|
document.getElementById('latest-dismiss').onclick = function() {
|
||
|
|
latestCheck.style.display = 'none';
|
||
|
|
document.cookie = cookieText;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
</script>
|
||
|
|
</body>
|
||
|
|
</html>
|