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590 lines
25 KiB
HTML
590 lines
25 KiB
HTML
<!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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gtag('config', 'UA-2577926-1', { 'anonymize_ip': true });
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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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'button': {
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'background': '#56cbdb',
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});
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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,URL,TextDecoder"></script>
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<script src="https://unpkg.com/d3@4.12.0/build/d3.js"></script>
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<link rel="stylesheet" href="raster.css">
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<title>Raster Source</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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</button>
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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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<a class="dropdown-item" href="../doc/">Docs</a>
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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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<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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<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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</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>6.5.0</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">Raster Source</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 active" 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" 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=pixel" class="badge badge-info">pixel</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="pixel"
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data-content="
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<a class="list-group-item list-group-item-action active" href="./raster.html">Raster Source</a>
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<a class="list-group-item list-group-item-action" href="./zoomify.html">Zoomify</a>"
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tabindex="0"
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>2</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=maptiler" class="badge badge-info">maptiler</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="maptiler"
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data-content="
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<a class="list-group-item list-group-item-action" href="./zoom-constrained.html">Constrained Zoom</a>
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<a class="list-group-item list-group-item-action" href="./disable-image-smoothing.html">Disable Image Smoothing</a>
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<a class="list-group-item list-group-item-action" href="./drag-and-drop.html">Drag-and-Drop</a>
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<a class="list-group-item list-group-item-action" href="./drag-and-drop-image-vector.html">Drag-and-Drop Image Vector</a>
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<a class="list-group-item list-group-item-action" href="./full-screen.html">Full Screen Control</a>
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<a class="list-group-item list-group-item-action" href="./full-screen-drag-rotate-and-zoom.html">Full Screen Drag, Rotate, and Zoom</a>
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<a class="list-group-item list-group-item-action" href="./gpx.html">GPX Data</a>
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<a class="list-group-item list-group-item-action" href="./image-filter.html">Image Filters</a>
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<a class="list-group-item list-group-item-action" href="./kml.html">KML</a>
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<a class="list-group-item list-group-item-action" href="./layer-spy.html">Layer Spy</a>
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<a class="list-group-item list-group-item-action" href="./layer-swipe.html">Layer Swipe</a>
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<a class="list-group-item list-group-item-action" href="./magnify.html">Magnify</a>
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<a class="list-group-item list-group-item-action" href="./mapbox-layer.html">Mapbox-gl Layer</a>
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<a class="list-group-item list-group-item-action" href="./feature-move-animation.html">Marker Animation</a>
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<a class="list-group-item list-group-item-action" href="./vector-osm.html">OSM XML</a>
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<a class="list-group-item list-group-item-action active" 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="./side-by-side.html">Shared Views</a>
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<a class="list-group-item list-group-item-action" href="./street-labels.html">Street Labels</a>
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<a class="list-group-item list-group-item-action" href="./mapbox-style.html">Vector tiles created from a Mapbox Style object</a>
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<a class="list-group-item list-group-item-action" href="./vector-tiles-4326.html">Vector tiles in EPSG:4326</a>
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<a class="list-group-item list-group-item-action" href="./vector-wfs.html">WFS</a>
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<a class="list-group-item list-group-item-action" href="./vector-wfs-getfeature.html">WFS - GetFeature</a>
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<a class="list-group-item list-group-item-action" href="./xyz-retina.html">XYZ Retina Tiles</a>"
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tabindex="0"
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>24</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 class="rel">
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<div id="map" class="map"></div>
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<div id="plot"></div>
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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">Demonstrates pixelwise operations with a raster source.</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 pixels. 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 imagery is used as input.
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For each pixel, the Vegetation Greenness Index
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(<a href="http://www.tandfonline.com/doi/abs/10.1080/10106040108542184#.Vb90ITBViko">VGI</a>)
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is calculated from the input pixels. A second operation colors
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those pixels based on a threshold value (values above the
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threshold are green and those below are transparent).
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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 RasterSource from 'ol/source/Raster';
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import View from 'ol/View';
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import XYZ from 'ol/source/XYZ';
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import {Image as ImageLayer, Tile as TileLayer} from 'ol/layer';
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var minVgi = 0;
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var maxVgi = 0.25;
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var bins = 10;
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/**
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* Calculate the Vegetation Greenness Index (VGI) from an input pixel. This
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* is a rough estimate assuming that pixel values correspond to reflectance.
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* @param {Array<number>} pixel An array of [R, G, B, A] values.
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* @return {number} The VGI value for the given pixel.
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*/
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function vgi(pixel) {
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var r = pixel[0] / 255;
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var g = pixel[1] / 255;
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var b = pixel[2] / 255;
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return (2 * g - r - b) / (2 * g + r + b);
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}
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/**
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* Summarize values for a histogram.
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* @param {numver} value A VGI value.
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* @param {Object} counts An object for keeping track of VGI counts.
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*/
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function summarize(value, counts) {
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var min = counts.min;
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var max = counts.max;
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var num = counts.values.length;
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if (value < min) {
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// do nothing
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} else if (value >= max) {
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counts.values[num - 1] += 1;
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} else {
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var index = Math.floor((value - min) / counts.delta);
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counts.values[index] += 1;
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}
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}
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/**
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* Use aerial imagery as the input data for the raster source.
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*/
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var key = 'Get your own API key at https://www.maptiler.com/cloud/';
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var attributions =
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'<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
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'<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';
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var aerial = new XYZ({
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attributions: attributions,
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url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
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maxZoom: 20,
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crossOrigin: '',
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});
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/**
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* Create a raster source where pixels with VGI values above a threshold will
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* be colored green.
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*/
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var raster = new RasterSource({
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sources: [aerial],
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/**
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* Run calculations on pixel data.
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* @param {Array} pixels List of pixels (one per source).
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* @param {Object} data User data object.
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* @return {Array} The output pixel.
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*/
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operation: function (pixels, data) {
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var pixel = pixels[0];
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var value = vgi(pixel);
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summarize(value, data.counts);
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if (value >= data.threshold) {
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pixel[0] = 0;
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pixel[1] = 255;
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pixel[2] = 0;
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pixel[3] = 128;
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} else {
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pixel[3] = 0;
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}
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return pixel;
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},
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lib: {
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vgi: vgi,
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summarize: summarize,
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},
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});
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raster.set('threshold', 0.1);
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function createCounts(min, max, num) {
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var values = new Array(num);
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for (var i = 0; i < num; ++i) {
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values[i] = 0;
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}
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return {
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min: min,
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max: max,
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values: values,
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delta: (max - min) / num,
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};
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}
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raster.on('beforeoperations', function (event) {
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event.data.counts = createCounts(minVgi, maxVgi, bins);
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event.data.threshold = raster.get('threshold');
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});
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raster.on('afteroperations', function (event) {
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schedulePlot(event.resolution, event.data.counts, event.data.threshold);
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});
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var map = new Map({
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layers: [
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new TileLayer({
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source: aerial,
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}),
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new ImageLayer({
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source: raster,
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}) ],
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target: 'map',
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view: new View({
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center: [-9651695, 4937351],
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zoom: 13,
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minZoom: 12,
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maxZoom: 19,
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}),
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});
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var timer = null;
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function schedulePlot(resolution, counts, threshold) {
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if (timer) {
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clearTimeout(timer);
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timer = null;
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}
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timer = setTimeout(plot.bind(null, resolution, counts, threshold), 1000 / 60);
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}
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var barWidth = 15;
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var plotHeight = 150;
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var chart = d3
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.select('#plot')
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.append('svg')
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.attr('width', barWidth * bins)
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.attr('height', plotHeight);
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var chartRect = chart.node().getBoundingClientRect();
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var tip = d3.select(document.body).append('div').attr('class', 'tip');
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function plot(resolution, counts, threshold) {
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var yScale = d3
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.scaleLinear()
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.domain([0, d3.max(counts.values)])
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.range([0, plotHeight]);
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var bar = chart.selectAll('rect').data(counts.values);
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bar.enter().append('rect');
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bar
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.attr('class', function (count, index) {
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var value = counts.min + index * counts.delta;
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return 'bar' + (value >= threshold ? ' selected' : '');
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|
})
|
|
.attr('width', barWidth - 2);
|
|
|
|
bar
|
|
.transition()
|
|
.attr('transform', function (value, index) {
|
|
return (
|
|
'translate(' +
|
|
index * barWidth +
|
|
', ' +
|
|
(plotHeight - yScale(value)) +
|
|
')'
|
|
);
|
|
})
|
|
.attr('height', yScale);
|
|
|
|
bar.on('mousemove', function (count, index) {
|
|
var threshold = counts.min + index * counts.delta;
|
|
if (raster.get('threshold') !== threshold) {
|
|
raster.set('threshold', threshold);
|
|
raster.changed();
|
|
}
|
|
});
|
|
|
|
bar.on('mouseover', function (count, index) {
|
|
var area = 0;
|
|
for (var i = counts.values.length - 1; i >= index; --i) {
|
|
area += resolution * resolution * counts.values[i];
|
|
}
|
|
tip.html(message(counts.min + index * counts.delta, area));
|
|
tip.style('display', 'block');
|
|
tip.transition().style({
|
|
left: chartRect.left + index * barWidth + barWidth / 2 + 'px',
|
|
top: d3.event.y - 60 + 'px',
|
|
opacity: 1,
|
|
});
|
|
});
|
|
|
|
bar.on('mouseout', function () {
|
|
tip
|
|
.transition()
|
|
.style('opacity', 0)
|
|
.each('end', function () {
|
|
tip.style('display', 'none');
|
|
});
|
|
});
|
|
}
|
|
|
|
function message(value, area) {
|
|
var acres = (area / 4046.86)
|
|
.toFixed(0)
|
|
.replace(/\B(?=(\d{3})+(?!\d))/g, ',');
|
|
return acres + ' acres at<br>' + value.toFixed(2) + ' VGI or above';
|
|
}
|
|
</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>Raster Source</title>
|
|
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
|
|
<script src="https://unpkg.com/elm-pep"></script>
|
|
<!-- The line below is 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,URL,TextDecoder"></script>
|
|
<script src="https://unpkg.com/d3@4.12.0/build/d3.js"></script>
|
|
<style>
|
|
.map {
|
|
width: 100%;
|
|
height:400px;
|
|
}
|
|
.rel {
|
|
position: relative
|
|
}
|
|
|
|
#plot {
|
|
pointer-events: none;
|
|
position: absolute;
|
|
bottom: 10px;
|
|
left: 10px;
|
|
}
|
|
|
|
.bar {
|
|
pointer-events: auto;
|
|
fill: #AFAFB9;
|
|
}
|
|
|
|
.bar.selected {
|
|
fill: green;
|
|
}
|
|
|
|
.tip {
|
|
position: absolute;
|
|
background: black;
|
|
color: white;
|
|
padding: 6px;
|
|
font-size: 12px;
|
|
border-radius: 4px;
|
|
margin-bottom: 10px;
|
|
display: none;
|
|
opacity: 0;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<div class="rel">
|
|
<div id="map" class="map"></div>
|
|
<div id="plot"></div>
|
|
</div>
|
|
<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": "raster",
|
|
"dependencies": {
|
|
"ol": "6.5.0"
|
|
},
|
|
"devDependencies": {
|
|
"parcel": "^2.0.0-beta.1"
|
|
},
|
|
"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="raster.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]) && '6.5.0' != 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>
|