Cesium 默认加载离线地图 NaturalEarthII

var viewer = new Cesium.Viewer("cesiumContainer", {
	timeline: false,
	homeButton: true,
	infoBox: false,
	animation: false,
	selectionIndicator: false,
	fullscreenButton: false,
	sceneModePicker: false,
	navigationHelpButton: false,
	geocoder: false,
	scene3DOnly: true,
	terrainProvider: new Cesium.EllipsoidTerrainProvider({}),
});
var imageryProviderViewModels = viewer.baseLayerPicker.viewModel.imageryProviderViewModels;
var terrainProviderViewModels = viewer.baseLayerPicker.viewModel.terrainProviderViewModels;
viewer.baseLayerPicker.viewModel.selectedImagery = imageryProviderViewModels[imageryProviderViewModels.length - 1];
viewer.baseLayerPicker.viewModel.selectedTerrain = terrainProviderViewModels[0];

viewer.imageryLayers.layerAdded.addEventListener(function () {
	setTimeout(function () {
		viewer.imageryLayers.orderByZIndex();
	}, 200);
});
viewer.scene.debugShowFramesPerSecond = true;

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