OptionalfailureOptionalgroundThe Esri Ground object being extended. This property can also be "world-elevation", in which case a default instance of Ground with the world elevation service will be used.
OptionalidThe unique ID to assign to the entity. If not specified, one will be generated.
OptionallayerOptionaltask
Properties that can be passed into the constructor for mapping/GroundExtension!GroundExtension.