This content has been marked as final. Show 1 reply
This is a great question.
Personally what I would do is:
1) Create a simple basemap with things that don't need to be turned on and off in JPEG cache format (no there is are no transparencies enabled).
2) Then select the layers you would like to be turned on and off and create seperate caches for them using PNG format. This way any areas withiout data will be represented as transparent.
Within the web application you could then specify which layers you would like to enable and disable for viewing (this can be done with any of the arcgis webapis)
Hope this helps,