Multiple BaseMap Layers

philippschnetzer

I am using three basemaps in my application:  a basemap consisting of a set of provincial layers which I have called 'surround', an aerial image basemap and also a DEM basemap.  My study area consists of three small areas in the province.  I am using the 'surround' basically just to add some context outside of the stuudy area.  My aerial and DEM basemaps fully cover the study area.  I always want to have the 'surround' basemap showing and then want to be able to toggle on/off the aerial and DEM basemaps as overlays on the surround.

So far I have only been able to show the surround overlaid with either the aerial or DEM but with no option to toggle on/off (this might be that 'hybrid' basemap functionality...).  As soon as I add the MapSwitcher widget and select the aerial or DEM basemaps the surround disappears.

How can I make the 'surround' always visible with no option to switch on/off but give the user the ability to turn on/off the aerial or DEM basemaps while the surround is still visible??

Help is much appreciated!

philippschnetzer

I have this working pretty good now with my basemap portion of the config.xml as follows:

<basemaps>       
         
         <layer label="Surround" type="tiled" visible="true" 
          url="http://192.168.80.100/ArcGIS/rest/services/SURROUND/MapServer"/>   
         
         <layer label="Aerial" type="tiled" visible="false" 
          url="http://192.168.80.100/ArcGIS/rest/services/SURROUND/MapServer"/>       
          
     <layer label="Aerial" type="tiled" visible="false" 
          url="http://192.168.80.100/ArcGIS/rest/services/AERIAL/MapServer"/>    
          
  <layer label="DEM" type="tiled" visible="false" 
          url="http://192.168.80.100/ArcGIS/rest/services/SURROUND/MapServer"/>       
          
     <layer label="DEM" type="tiled" visible="false" 
          url="http://192.168.80.100/ArcGIS/rest/services/DEM/MapServer"/>    
                                                           
        </basemaps>

But, the only issue I have is that when either the Aerial or DEM button is clicked on the app then the 'Surround' basemap actually has to redraw.  I have not been able to figure out a way to just keep the 'Surround' always visible without having it redrawn when the Aerial or DEM is selected....

Also, another nice feature would be able to hide/exclude a certain basemap from appearing on the buttons..ideally I would have just a button for 'Aerial' and one for 'DEM' that when clicked toggle that layer on/off.  Right now I basically have three buttons - 'Surround', 'Aerial' and 'DEM' and the 'Surround' button just functions as a button to clear either the 'Aerial' or 'DEM' layers if they are turned on...