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Add a topographic map
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Description
This sample shows how to add a topographic basemap layer to your application. The sample uses a cached map service from ArcGIS Online. You can browse the ArcGIS.com site for additional online basemap and reference map services or publish your own geographic data as a service using ArcGIS Server.
This sample sets the initial extent of the map to an area in San Francisco using following code:
var initExtent = new esri.geometry.Extent({"xmin":-13635568.034589134,"ymin":4541606.359162286,"xmax":-13625430.573712826,"ymax":4547310.472398059,"spatialReference":{"wkid":102100}});map = new esri.Map("map",{extent:initExtent});
If you want the map to start with a different initial extent you can easily determine the extent values using your browser's debugging tools. Below are the steps for calculating a new extent using Firefox with Firebug installed.
- Run the application.
- Zoom to the new extent.
- Enable Firebug and click the Console tab
- Enter the following:
dojo.toJson(map.extent.toJson()); - Copy the results and paste them into the JavaScript code replacing the existing initExtent.
Note: You can perform the same steps using Developer Tools in Internet Explorer or Chrome.
Code
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>Topographic Map</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.29/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.29/esri/css/esri.css">
<style>
html, body { height: 100%; width: 100%; margin: 0; padding: 0; }
#map{
padding:0;
}
</style>
<script>var dojoConfig = {parseOnLoad: true};</script>
<script src="https://js.arcgis.com/3.29/"></script>
<script>
dojo.require("dijit.layout.BorderContainer");
dojo.require("dijit.layout.ContentPane");
dojo.require("esri.map");
var map;
function init() {
map = new esri.Map("map", {
basemap: "topo",
center: [-122.41, 37.75],
zoom: 14
});
}
dojo.ready(init);
</script>
</head>
<body class="claro">
<div data-dojo-type="dijit.layout.BorderContainer"
data-dojo-props="design:'headline', gutters:false"
style="width: 100%; height: 100%; margin: 0;">
<div id="map"
data-dojo-type="dijit.layout.ContentPane"
data-dojo-props="region:'center'">
</div>
</div>
</body>
</html>