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Show points of gridded data source.html
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Show points of gridded data source.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Show points of gridded data source - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to overlay a gridded data source on the map and the data points that are aggregated inside." />
<meta name="keywords" content="Microsoft maps, maps, map, API, SDK, GIS, earthquakes, USGS, bivariate, data binning, data bin, gridding, hexgrid, hexbins, hexagon bins, tessellations, thematic, choropleth, heatmap, heat map, polygon extrusion, extruded polygons" />
<meta name="author" content="Microsoft Azure Maps" /><meta name="version" content="1.0" />
<meta name="screenshot" content="screenshot.jpg" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.css" rel="stylesheet" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.js"></script>
<!-- Add reference to the gridded data source module. -->
<script src="/lib/azure-maps/azure-maps-gridded-data-source.min.js"></script>
<script>
var map, datasource;
//GeoJSON feed of all earthquakes from the past 30 days. Sourced from the USGS.
var earthquakeFeed = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson";
var defaultColor = '#2c9cea';
var colorScale = [
25, '#73ffdc',
50, '#f9ffb9',
75, '#ffb849',
100, '#ca0056'
];
function getMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
zoom: 1,
view: 'Auto',
style: 'grayscale_dark',
//Add authentication details for connecting to Azure Maps.
authOptions: {
//Use Microsoft Entra ID authentication.
authType: 'anonymous',
clientId: 'e6b6ab59-eb5d-4d25-aa57-581135b927f0', //Your Azure Maps client id for accessing your Azure Maps account.
getToken: function (resolve, reject, map) {
//URL to your authentication service that retrieves an Microsoft Entra ID Token.
var tokenServiceUrl = 'https://samples.azuremaps.com/api/GetAzureMapsToken';
fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
}
//Alternatively, use an Azure Maps key. Get an Azure Maps key at https://azure.com/maps. NOTE: The primary key should be used as the key.
//authType: 'subscriptionKey',
//subscriptionKey: '[YOUR_AZURE_MAPS_KEY]'
}
});
//Create a legend.
createLegend();
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a data source to store point data.
pointDatasource = new atlas.source.DataSource();
map.sources.add(pointDatasource);
//Load earthquake data into the point data source. When it completes, copy the points into the gridded data source.
pointDatasource.importDataFromUrl(earthquakeFeed).then(() => {
datasource.add(pointDatasource.toJson());
});
//Create an instance of the gridded data source.
datasource = new atlas.source.GriddedDataSource(null, {
cellWidth: 300,
distanceUnits: 'miles'
});
map.sources.add(datasource);
//Create a stepped expression based on the color scale.
var steppedExp = [
'step',
['get', 'point_count'],
defaultColor
];
steppedExp = steppedExp.concat(colorScale);
map.layers.add([
//Create layers to render the polygon and outline of each grid cell.
new atlas.layer.PolygonLayer(datasource, null, {
fillColor: steppedExp,
fillOpacity: 0.9
}),
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'white',
strokeWidth: 1,
}),
//Create a layer to render the individual points on the map.
new atlas.layer.BubbleLayer(pointDatasource, null, {
createIndicators: true, // to enable bubble layer a11y feature
radius: 2,
color: '#ff007f',
strokeWidth: 0
})
], 'labels');
});
}
function changeGridType(elm) {
datasource.setOptions({ gridType: elm.options[elm.selectedIndex].value });
}
function createLegend() {
var html = [];
html.push('<i style="background:', defaultColor, '"></i> 1 - ', colorScale[0], '<br/>');
for (var i = 0; i < colorScale.length; i += 2) {
html.push(
'<i style="background:', (colorScale[i + 1]), '"></i> ',
colorScale[i], (colorScale[i + 2] ? ' - ' + colorScale[i + 2] + '<br/>' : '+')
);
}
document.getElementById('legendColors').innerHTML += html.join('');
}
</script>
<style>
#legend {
position: absolute;
top: 1px;
left: 5px;
font-family: Arial;
font-size: 12px;
background-color: white;
border-radius: 5px;
padding: 5px;
line-height: 20px;
}
#legend i {
width: 18px;
height: 18px;
float: left;
margin-right: 8px;
}
</style>
</head>
<body onload="getMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<div id="legend">
<b>Earthquakes per cell</b><br/>
<div id="legendColors"></div><br/>
<b>Grid type:</b><br/>
<select onchange="changeGridType(this);">
<option value="circle">Circle</option>
<option selected="selected" value="hexagon">Hexagon</option>
<option value="hexCircle">Hex Circle</option>
<option value="pointyHexagon">Pointy Hexagon</option>
<option value="square">Square</option>
<option value="triangle">Triangle</option>
</select>
</div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend>Show points of gridded data source</legend>
This sample shows how to overlay a gridded data source on the map and the data points that are aggregated inside.
The data in this sample is all earthquakes that have occured in the past month.
This samples uses the open source <a href="https://github.com/Azure-Samples/azure-maps-gridded-data-source" target="_blank">Azure Maps Gridded Data Source module</a>.
</fieldset>
</body>
</html>