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<!DOCTYPE html>
<html lang="en">
<head>
<title>Display isoline data - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico" />
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to display isoline data on the map add apply a data driven styling to assign colors. Isolines are also known as contour lines." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, line, linestring, polyline, layer, isobands, isoband, isolines, isoline, contour, linelayer, data-driven, data driven styling, earthquakes, USGS" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<script type='text/javascript'>
var map, datasource;
//Earthquake intensity contours of M7.0 – 1km WSW of Kumamoto-shi, Japan (GeoJson source from usgs.gov: https://earthquake.usgs.gov/data/shakemap/)
var contourLineDataUrl = 'https://earthquake.usgs.gov/archive/product/shakemap/us20005iis/us/1467057010522/download/cont_psa03.json';
function GetMap() {
//Point the Azure Maps domain to the US Azure Gov Cloud domain.
atlas.setDomain('atlas.azure.us');
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [131.074968, 32.944332],
zoom: 8,
style: 'grayscale_light',
view: 'Auto',
//Add authentication details for connecting to Azure Maps.
authOptions: {
//Use Azure Active Directory authentication.
authType: 'anonymous',
clientId: 'c9f2f391-13f1-407b-a4a5-f0a241bacfbf', //Your Azure Active Directory client id for accessing your Azure Maps account.
getToken: function (resolve, reject, map) {
//URL to your authentication service that retrieves an Azure Active Directory Token.
var tokenServiceUrl = 'https://azuremapscodesamples.azurewebsites.us/Common/TokenService.ashx';
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>'
}
});
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a data source and add it to the map.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Create a layer to render line data.
map.layers.add(new atlas.layer.LineLayer(datasource, null, {
strokeWidth: 3,
//Use a data-driven expression based on a property on each line to assign a color.
strokeColor: [
'step',
['get', 'value'],
'transparent', //If value is less than 40, make it transparent.
40, 'rgb(25, 150, 65)', //40 - 80 color
80, 'rgb(140, 202, 32)', //80 - 120 color
120, 'rgb(255, 255, 0)', //120 - 160 color
160, 'rgb(235, 140, 14)', //160 - 200 color
200, 'rgb(215, 25, 28)' //200+ color
]
}));
//Load data that represents contour lines.
datasource.importDataFromUrl(contourLineDataUrl);
});
}
</script>
<style>
.legend {
position: absolute;
top: 10px;
left: 10px;
background-color: white;
border-radius: 10px;
padding: 10px;
}
.colorband {
width: 100px;
padding: 2px;
text-align: center;
}
</style>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<div class="legend">
<div class="colorband" style="background-color: rgb(215, 25, 28)">200%g</div>
<div class="colorband" style="background-color: rgb(235, 140, 14)">160%g</div>
<div class="colorband" style="background-color: rgb(255, 255, 0)">120%g</div>
<div class="colorband" style="background-color: rgb(140, 202, 32)">80%g</div>
<div class="colorband" style="background-color: rgb(25, 150, 65)">40%g</div>
</div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend><h1 style="font-size:16px">Display isoline data</h1></legend>
This sample shows how to display isoline data on the map add apply a data driven styling to assign colors. Isolines are also known as contour lines.
The data in this sample represents Earthquake intensity contours of M7.0 – 1km WSW of Kumamoto-shi, Japan and is sourced from the <a href="https://earthquake.usgs.gov/data/shakemap/">USGS Earthquake Hazards Program</a>.
</fieldset>
</body>
</html>