Note that this is an "abstract" model and should never be instantiated directly. Only its subtypes can be directly instantiated.
RasterImageModel is not supported in hardware-accelerated map.
An event indicating that this Controller is invalidated. Invalidated means that data has changed and the visualization needs to be refreshed. This event fires when #invalidate is called.
Signals that the underlying data for the tiled images has changed. If this model is added to a map using a RasterImageLayer, calling this method will thus trigger a refresh of the visualization.