OptionalbaseAn array of BasemapLayer objects defining the basemaps used in the web map/web scene.
OptionalelevationDeprecated, use ground.layers instead. An array of elevationLayer objects defining the basemaps used in the web scene.
OptionalidAn identifier used to refer to the basemap when referencing it elsewhere.
NOTE: Only available in web scenes!
OptionaltitleString title for the basemap that can be used in a table of contents. If not defined, then it takes the title of the first baseMapLayer in the array.
Properties that can be specified for the mapping/BasemapExtension!BasemapExtensionProperties.basemap property.