以官网给的叠加二维地图的示例和发布的长春平面图为例：
官网地址：http://support.supermap.com.cn:8090/webgl/examples/webgl/editor.html#SuperMapTileImagery
长春地图服务地址：http://support.supermap.com.cn:8090/iserver/services/map-changchun/rest/maps/长春市区图
将长春的地图服务地址丢进这个示例中并没有在地球模型上加载出来长春的图，控制台没有报错，代码如下（可以直接粘进去运行）：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
<title>叠加二维地图</title>
<link href="../../Build/Cesium/Widgets/widgets.css" rel="stylesheet">
<link href="./css/bootstrap.min.css" rel="stylesheet">
<link href="./css/pretty.css" rel="stylesheet">
<script src="./js/jquery.min.js"></script>
<script src="./js/bootstrap.min.js"></script>
<script src="./js/bootstrap-select.min.js"></script>
<script type="text/javascript" src="http://www.supermapol.com/earth/Build/Cesium/Cesium.js"></script>
<script src="./js/config.js"></script>
</head>
<body>
<div id="cesiumContainer"></div>
<div id='loadingbar' class="spinner">
<div class="spinner-container container1">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container2">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container3">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
</div>
<div id="toolbar" style="position: absolute;left: 5px;top: 5px;display: none;">
<select id="imageryOptions" class="selectpicker show-tick form-control">
<option selected value="MEC">墨卡托投影坐标系</option>
<option value="WGS">经纬度坐标系</option>
</select>
</div>
<script>
function onload(Cesium) {
//初始化viewer部件
var viewer = new Cesium.Viewer('cesiumContainer');
var imageryLayers = viewer.imageryLayers;
//利用服务url创建SuperMapImageryProvider实例
var provider_wgs = new Cesium.SuperMapImageryProvider({
url : URL_CONFIG.SUPERMAP_IMG_WGS //经纬度地图服务
});
var provider_mec = new Cesium.SuperMapImageryProvider({
url : 'http://support.supermap.com.cn:8090/iserver/services/map-changchun/rest/maps/长春市区图'
});
var imagery_wgs,imagery_mec;
//初始化时添加经纬度投影地图图层
imagery_mec = imageryLayers.addImageryProvider(provider_mec);
imagery_mec.alpha = 1.0;
imagery_wgs = imageryLayers.addImageryProvider(provider_wgs);
imagery_wgs.alpha = 0;
//添加下拉菜单，点击选项切换地图服务
$('#imageryOptions').change(function(){
var value = $(this).val();
if(value == 'WGS'){
if(!imagery_wgs){
imagery_wgs = imageryLayers.addImageryProvider(provider_wgs);
}
imagery_wgs.alpha = 1.0;
if(imagery_mec){
imagery_mec.alpha = 0;
}
}
else if(value == 'MEC'){
if(!imagery_mec){
imagery_mec = imageryLayers.addImageryProvider(provider_mec);
}
imagery_mec.alpha = 1.0;
if(imagery_wgs){
imagery_wgs.alpha = 0;
}
}
});
$('#toolbar').show();
$('#loadingbar').remove();
}
if (typeof Cesium !== 'undefined') {
window.startupCalled = true;
onload(Cesium);
}
</script>
</body>
</html>
