Bing Maps road/satellite datasets are available at varying scale ranges, with populated areas supporting larger scales than empty rural areas. When zooming somewhere with no map/satellite data, a "broken camera" icon is shown. We'd like to avoid showing this ugly icon.
How can we restrict the maximum zoom scale where the map/satellite is not available, but allow full zoom-in where it is available?
Google Maps does this quite well - as you move around the world you can see the Zoom Slider expand/contract depending on what datasets are available at that location. They presumably have metadata showing the presence/absence of data, so we seek emulate this when using Bing Maps, with no access to the metadata.