Mercator Projection and Geospatial Circles.html

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Mercator Projection and Geospatial Circles - Azure Maps Web SDK Samples</title>

    <meta charset="utf-8" />
    <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 your Azure Maps subscription key to the map SDK. Get an Azure Maps key at https://azure.com/maps
                authOptions: {
                    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>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>Mercator Projection and Geospatial Circles - Azure Maps Web SDK Samples</title>

	<meta charset="utf-8" />
	<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 your Azure Maps subscription key to the map SDK. Get an Azure Maps key at https://azure.com/maps
	authOptions: {
	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>