Update App.js

public/Source/App.js

@@ -11,7 +11,9 @@
 		 animation: false,
 		 shadow: false,
 		 // // Set default basemap
-            imageryProvider : Cesium.ArcGisMapServerImageryProvider({url : 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer'}),
+           imageryProvider : new Cesium.ArcGisMapServerImageryProvider({
+    url : 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer',
+	enablePickFeatures: false,
 		 baseLayerPicker: true
 		 
      });
@@ -194,4 +196,4 @@
 	 colorstyle1.addEventListener('change', set3DColorStyle);
      colorstyle2.addEventListener('change', set3DColorStyle);
 	 colorstyle3.addEventListener('change', set3DColorStyle);
-	
\ No newline at end of file
+