实例

var viewer = new Cesium.Viewer('cesiumContainer', {

    imageryProvider : Cesium.createWorldImagery({

        style : Cesium.IonWorldImageryStyle.AERIAL_WITH_LABELS

    }),

    baseLayerPicker : false

}); //先初始化地图

var layers = viewer.scene.imageryLayers;  //初始化图层

var blackMarble = layers.addImageryProvider(new Cesium.IonImageryProvider({ assetId: 3812 }));  //加载图标

blackMarble.alpha = 0.5;  // 调整透明度

blackMarble.brightness = 2.0;   //调整对比度

layers.addImageryProvider(new Cesium.SingleTileImageryProvider({

    url : '../images/Cesium_Logo_overlay.png',  //加载图片路径

    rectangle : Cesium.Rectangle.fromDegrees(-75.0, 28.0, -67.0, 29.75)  //加载图片坐标

}));   //加载图片