Add vectortile branch
This commit is contained in:
Andreas Hocevar
@@ -0,0 +1,567 @@
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<!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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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" type="text/css">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism.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="http://d3js.org/d3.v3.min.js"></script>
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<link rel="stylesheet" href="raster.css">
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<link rel="stylesheet" href="raster.css">
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<script src="./resources/zeroclipboard/ZeroClipboard.min.js"></script>
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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" role="navigation">
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<div class="container" id="navbar-inner-container">
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<a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png"> OpenLayers 3 Examples</a>
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</div>
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</header>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12 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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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">Raster Source</h4>
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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 id="tags">raster, pixel</div>
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<div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.layer.Image.html" title="API documentation for ol.layer.Image">ol.layer.Image</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.source.BingMaps.html" title="API documentation for ol.source.BingMaps">ol.source.BingMaps</a></li>,<li><a href="../apidoc/ol.source.Raster.html" title="API documentation for ol.source.Raster">ol.source.Raster</a></li></ul></div>
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</div>
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</div>
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<div class="row-fluid">
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<div id="source-controls">
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<a id="copy-button"><i class="fa fa-clipboard"></i> Copy</a>
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<a id="jsfiddle-button"><i class="fa fa-jsfiddle"></i> Edit</a>
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</div>
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<form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
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<textarea class="hidden" name="js">// NOCOMPILE
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// this example uses d3 for which we don't have an externs file.
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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 {ol.raster.Pixel} 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 bing = new ol.source.BingMaps({
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key: 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3',
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imagerySet: 'Aerial'
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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 ol.source.Raster({
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sources: [bing],
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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 ol.Map({
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layers: [
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new ol.layer.Tile({
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source: bing
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}),
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new ol.layer.Image({
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source: raster
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})
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],
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target: 'map',
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view: new ol.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.select('#plot').append('svg')
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.attr('width', barWidth * bins)
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.attr('height', plotHeight);
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var chartRect = chart[0][0].getBoundingClientRect();
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var tip = d3.select(document.body).append('div')
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.attr('class', 'tip');
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function plot(resolution, counts, threshold) {
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var yScale = d3.scale.linear()
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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.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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})
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.attr('width', barWidth - 2);
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bar.transition().attr('transform', function(value, index) {
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return 'translate(' + (index * barWidth) + ', ' +
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(plotHeight - yScale(value)) + ')';
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})
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.attr('height', yScale);
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bar.on('mousemove', function(count, index) {
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var threshold = counts.min + (index * counts.delta);
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if (raster.get('threshold') !== threshold) {
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raster.set('threshold', threshold);
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raster.changed();
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}
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});
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bar.on('mouseover', function(count, index) {
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var area = 0;
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for (var i = counts.values.length - 1; i >= index; --i) {
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area += resolution * resolution * counts.values[i];
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}
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tip.html(message(counts.min + (index * counts.delta), area));
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tip.style('display', 'block');
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tip.transition().style({
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left: (chartRect.left + (index * barWidth) + (barWidth / 2)) + 'px',
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top: (d3.event.y - 60) + 'px',
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opacity: 1
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});
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});
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bar.on('mouseout', function() {
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tip.transition().style('opacity', 0).each('end', function() {
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tip.style('display', 'none');
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});
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});
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}
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function message(value, area) {
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var acres = (area / 4046.86).toFixed(0).replace(/\B(?=(\d{3})+(?!\d))/g, ',');
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return acres + ' acres at<br>' + value.toFixed(2) + ' VGI or above';
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}
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</textarea>
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<textarea class="hidden" name="css">.rel {
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position: relative
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}
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#plot {
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pointer-events: none;
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position: absolute;
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bottom: 10px;
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left: 10px;
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}
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.bar {
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pointer-events: auto;
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fill: #AFAFB9;
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}
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.bar.selected {
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fill: green;
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}
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.tip {
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position: absolute;
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background: black;
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color: white;
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padding: 6px;
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font-size: 12px;
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border-radius: 4px;
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margin-bottom: 10px;
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display: none;
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opacity: 0;
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}
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</textarea>
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<textarea class="hidden" name="html"><div class="row-fluid">
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<div class="span12 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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</textarea>
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<input type="hidden" name="wrap" value="l">
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<input type="hidden" name="resources" value="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css,https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js,http://openlayers.org/en/v3.8.2/css/ol.css,http://openlayers.org/en/v3.8.2/build/ol.js">
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</form>
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<pre><code id="example-source" class="language-markup"><!DOCTYPE html>
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<html>
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<head>
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<title>Raster Source</title>
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<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
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<link rel="stylesheet" href="http://openlayers.org/en/v3.8.2/css/ol.css" type="text/css">
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<script src="http://openlayers.org/en/v3.8.2/build/ol.js"></script>
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<script src="http://d3js.org/d3.v3.min.js"></script>
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<link rel="stylesheet" href="raster.css">
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<style>
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.rel {
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position: relative
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}
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#plot {
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pointer-events: none;
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position: absolute;
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bottom: 10px;
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left: 10px;
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}
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.bar {
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pointer-events: auto;
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fill: #AFAFB9;
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}
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.bar.selected {
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fill: green;
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}
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.tip {
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position: absolute;
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background: black;
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color: white;
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padding: 6px;
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font-size: 12px;
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border-radius: 4px;
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margin-bottom: 10px;
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display: none;
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opacity: 0;
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}
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</style>
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</head>
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<body>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12 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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</div>
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<script>
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// NOCOMPILE
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// this example uses d3 for which we don't have an externs file.
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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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|
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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 {ol.raster.Pixel} 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;
|
||||
var g = pixel[1] / 255;
|
||||
var b = pixel[2] / 255;
|
||||
return (2 * g - r - b) / (2 * g + r + b);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Summarize values for a histogram.
|
||||
* @param {numver} value A VGI value.
|
||||
* @param {Object} counts An object for keeping track of VGI counts.
|
||||
*/
|
||||
function summarize(value, counts) {
|
||||
var min = counts.min;
|
||||
var max = counts.max;
|
||||
var num = counts.values.length;
|
||||
if (value < min) {
|
||||
// do nothing
|
||||
} else if (value >= max) {
|
||||
counts.values[num - 1] += 1;
|
||||
} else {
|
||||
var index = Math.floor((value - min) / counts.delta);
|
||||
counts.values[index] += 1;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Use aerial imagery as the input data for the raster source.
|
||||
*/
|
||||
var bing = new ol.source.BingMaps({
|
||||
key: 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3',
|
||||
imagerySet: 'Aerial'
|
||||
});
|
||||
|
||||
|
||||
/**
|
||||
* Create a raster source where pixels with VGI values above a threshold will
|
||||
* be colored green.
|
||||
*/
|
||||
var raster = new ol.source.Raster({
|
||||
sources: [bing],
|
||||
operation: function(pixels, data) {
|
||||
var pixel = pixels[0];
|
||||
var value = vgi(pixel);
|
||||
summarize(value, data.counts);
|
||||
if (value >= data.threshold) {
|
||||
pixel[0] = 0;
|
||||
pixel[1] = 255;
|
||||
pixel[2] = 0;
|
||||
pixel[3] = 128;
|
||||
} else {
|
||||
pixel[3] = 0;
|
||||
}
|
||||
return pixel;
|
||||
},
|
||||
lib: {
|
||||
vgi: vgi,
|
||||
summarize: summarize
|
||||
}
|
||||
});
|
||||
raster.set('threshold', 0.1);
|
||||
|
||||
function createCounts(min, max, num) {
|
||||
var values = new Array(num);
|
||||
for (var i = 0; i < num; ++i) {
|
||||
values[i] = 0;
|
||||
}
|
||||
return {
|
||||
min: min,
|
||||
max: max,
|
||||
values: values,
|
||||
delta: (max - min) / num
|
||||
};
|
||||
}
|
||||
|
||||
raster.on('beforeoperations', function(event) {
|
||||
event.data.counts = createCounts(minVgi, maxVgi, bins);
|
||||
event.data.threshold = raster.get('threshold');
|
||||
});
|
||||
|
||||
raster.on('afteroperations', function(event) {
|
||||
schedulePlot(event.resolution, event.data.counts, event.data.threshold);
|
||||
});
|
||||
|
||||
var map = new ol.Map({
|
||||
layers: [
|
||||
new ol.layer.Tile({
|
||||
source: bing
|
||||
}),
|
||||
new ol.layer.Image({
|
||||
source: raster
|
||||
})
|
||||
],
|
||||
target: 'map',
|
||||
view: new ol.View({
|
||||
center: [-9651695, 4937351],
|
||||
zoom: 13,
|
||||
minZoom: 12,
|
||||
maxZoom: 19
|
||||
})
|
||||
});
|
||||
|
||||
|
||||
var timer = null;
|
||||
function schedulePlot(resolution, counts, threshold) {
|
||||
if (timer) {
|
||||
clearTimeout(timer);
|
||||
timer = null;
|
||||
}
|
||||
timer = setTimeout(plot.bind(null, resolution, counts, threshold), 1000 / 60);
|
||||
}
|
||||
|
||||
var barWidth = 15;
|
||||
var plotHeight = 150;
|
||||
var chart = d3.select('#plot').append('svg')
|
||||
.attr('width', barWidth * bins)
|
||||
.attr('height', plotHeight);
|
||||
|
||||
var chartRect = chart[0][0].getBoundingClientRect();
|
||||
|
||||
var tip = d3.select(document.body).append('div')
|
||||
.attr('class', 'tip');
|
||||
|
||||
function plot(resolution, counts, threshold) {
|
||||
var yScale = d3.scale.linear()
|
||||
.domain([0, d3.max(counts.values)])
|
||||
.range([0, plotHeight]);
|
||||
|
||||
var bar = chart.selectAll('rect').data(counts.values);
|
||||
|
||||
bar.enter().append('rect');
|
||||
|
||||
bar.attr('class', function(count, index) {
|
||||
var value = counts.min + (index * counts.delta);
|
||||
return 'bar' + (value >= threshold ? ' selected' : '');
|
||||
})
|
||||
.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';
|
||||
}
|
||||
|
||||
</script>
|
||||
</body>
|
||||
</html></code></pre>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
|
||||
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
|
||||
<script src="./resources/common.js"></script>
|
||||
<script src="./resources/prism/prism.min.js"></script>
|
||||
<script src="loader.js?id=raster"></script>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user