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AzureMapsGovCloudCodeSamples/AzureMapsCodeSamples/Polygon and Polygon Extrusion Layers/Mercator Projection and Geospatial Circles.html
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<title>Mercator Projection and Geospatial Circles - 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 the Mercator projection of the map affects the scale of geospatially accurate objects on the map." /> | |
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, circle, geospatial, mercator, projection" /> | |
<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; | |
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: [-45, 70], | |
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 circles and add to the data source. | |
datasource.add([ | |
//Create a circle that is 750KM in radius over Brazil. | |
new atlas.data.Feature(new atlas.data.Point([-52, -10]), { | |
subType: "Circle", | |
radius: 750000 | |
}), | |
//Create a second circle that is 750KM in radius, but over Greenland. | |
new atlas.data.Feature(new atlas.data.Point([-41, 75]), { | |
subType: "Circle", | |
radius: 750000 | |
}) | |
]); | |
//Create a polygon layer to render the filled in area of the circle polygon, and add it to the map. | |
map.layers.add(new atlas.layer.PolygonLayer(datasource, null, { | |
fillColor: 'rgba(255, 140, 0, 0.5)' | |
})); | |
}); | |
} | |
</script> | |
</head> | |
<body onload="GetMap()"> | |
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div> | |
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;"> | |
<legend><h1 style="font-size:16px">Mercator Projection and Geospatial Circles</h1></legend> | |
This sample shows how the Mercator projection of the map affects the scale of geospatially accurate objects on the map. | |
In this sample both circles have a radius of 750KM (750,000 meters). However, the closer the circle is to the North or South pole, the larger and more elliptical it appears. | |
</fieldset> | |
</body> | |
</html> |