Basemaps
The basemaps identify the maps that are available for display.
The basemap with the lowest value in the Display Order field displays by default.
You can select another basemap by clicking the Show Details tab above the map and selecting from the Switch Basemap list. The Show Details tab also displays information about the map that is provided by the map vendor.
The basemap record requires that you specify the REST URL of the Esri server that is providing the map service. If the URL is correct and valid, the basemap service description that is provided by the Esri server renders on the bottom of the GIS Base Map form. If instead of the basemap service description, nothing displays or you see an error, confirm that your Esri server enabled the basemap service with REST endpoints.
You can change the icon that shows when the basemap shows in the Switch Basemap list in the Show Details tab of the map. When the Thumbnail URL field points to a valid image, it is displayed in the Switch Basemap list. If you do not specify a value, the default image appears.