# Setting isBaseLayer to true on added layer? **URL:** \ **Category:** CesiumJS\ **Created:** [October 18, 2013, 8:59am UTC](https://community.cesium.com/t/setting-isbaselayer-to-true-on-added-layer/787 "2013-10-18T08:59:43Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![adam.dunnage](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@adam.dunnage](https://community.cesium.com/u/adam.dunnage)\ **Post date:** [October 18, 2013, 8:59am UTC](https://community.cesium.com/t/setting-isbaselayer-to-true-on-added-layer/787/1 "2013-10-18T08:59:43Z")
I currently have this function for adding base layers: function addBaseLayerOption(name, imageryProvider, alpha, show) {   var layer = imageryLayerCollection.addImageryProvider(imageryProvider);   layer.alpha = Cesium.defaultValue(alpha, 0);   layer.show = Cesium.defaultValue(show, true);   layer.name = name; } When these layers are being added however they are not being set to isBaseLayer true. How can I set it so that each layer that is added the isBaseLayer is set to true? ---
**Author:** ![Kevin\_Ring](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/kevin_ring/32/2003_2.png) [@Kevin\_Ring](https://community.cesium.com/u/Kevin_Ring)\ **Post date:** [October 18, 2013, 2:49pm UTC](https://community.cesium.com/t/setting-isbaselayer-to-true-on-added-layer/787/2 "2013-10-18T14:49:22Z")
Hi Adam, Only one layer (the base one) can be the base layer. What are you actually trying to do? Kevin ---
**Author:** ![adam.dunnage](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@adam.dunnage](https://community.cesium.com/u/adam.dunnage)\ **Post date:** [October 21, 2013, 8:29am UTC](https://community.cesium.com/t/setting-isbaselayer-to-true-on-added-layer/787/3 "2013-10-21T08:29:13Z")
I have managed to get around this problem but have hit another in doing this. I have an application which starts up and when it does places a layer on the globe for example: var blackMarble = layers.addImageryProvider(new Cesium.TileMapServiceImageryProvider({     url : ‘[http://cesium.agi.com/blackmarble](http://cesium.agi.com/blackmarble)’,     maximumLevel : 8,     credit : ‘Black Marble imagery courtesy NASA Earth Observatory’ })); I then have my own toolbox of buttons for different layers to add. When a button is clicked then a new layer is added and the starting layer is removed like so:     function addBaseLayerOption(name, imageryProvider, alpha, show) {       var layer = imageryLayerCollection.addImageryProvider(imageryProvider, 1);       layer.alpha = Cesium.defaultValue(alpha, 0);       layer.show = Cesium.defaultValue(show, true);       layer.name = name;       var layer2 = imageryLayerCollection.get(0);       imageryLayerCollection.remove(layer2);     } However the layer is then not displayed and all that is displayed is plain blue view on the globe as if there are no layers. I have check in Chrome dev tools in the imageryLayerCollection and the layer is there and isBaseLayer is true so by my understanding the layer should be displayed should it not? ---
**Author:** ![adam.dunnage](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@adam.dunnage](https://community.cesium.com/u/adam.dunnage)\ **Post date:** [October 21, 2013, 9:47am UTC](https://community.cesium.com/t/setting-isbaselayer-to-true-on-added-layer/787/4 "2013-10-21T09:47:59Z")
Not to worry I have managed to solve this. ---
**Author:** ![Daniel\_Santillan](https://avatars.discourse-cdn.com/v4/letter/d/82dd89/32.png) [@Daniel\_Santillan](https://community.cesium.com/u/Daniel_Santillan)\ **Post date:** [October 28, 2014, 9:17am UTC](https://community.cesium.com/t/setting-isbaselayer-to-true-on-added-layer/787/5 "2014-10-28T09:17:02Z")
Hi, it has been some time since your post, but i have the same exact problem (using my own tools to manage the layers), when i set show to false for one layer and another to true, the globe just stays blue, without requesting the new tiles. If a switch one more time curiously it loads the tiles. From what i can see i create the layers pretty much as you did. how did you solve this? ---
**Author:** ![Daniel\_Santillan](https://avatars.discourse-cdn.com/v4/letter/d/82dd89/32.png) [@Daniel\_Santillan](https://community.cesium.com/u/Daniel_Santillan)\ **Post date:** [October 28, 2014, 10:04am UTC](https://community.cesium.com/t/setting-isbaselayer-to-true-on-added-layer/787/6 "2014-10-28T10:04:58Z")
Hi, managed to solve the problem. It was my fault, when setting the show property of the layer i used a wrong getter and i imagine it was undefined. When i set the show value of each layer correctly it worked as expected. Kind regards!