Bob,
Using the TPK is a bit of a workaround. We do intend to support some raster files, but right now a TPK is the only way for explorer to display raster information.
Is there any way to retain the legend for the raster in the mobile map package?
This is a shortcoming of using the TPK, and in a larger sense there probably should be a way to create a custom legend for a map that is independent from the layers and layer rendering in the map. For data like yours some have included a duplicate 'minimal' vector layer with the legend information they want. I have even seen users add a map extent polygon, symbolized 99% transparent, where feature popup is configured with attachment (PDF file) to provide legend and other information.
What is the benefit of making these raster layers basemaps vs just regular layers?
In general it is good practice to have basemap in Mobile Map Packages that you create, though it is not required. In the example I posted I combined the bear habitat with DEM layers which creates a single TPK and saves a bit of space from having 3 separate TPKs. However, if your intent is to have all of the layers in a single map, then by all means a TPK for each as operational layer is the way to go. This allows users to turn the layers on and off in Explorer. Basemap layers are represented as a 'singular background picture' in Explorer and cannot be interacted with.
Do you foresee layer transparency control coming to explorer?
How do you want to use layer transparency in Explorer, or how do you envision your map users using it?
Just in general if you could share a little information on how users are supposed to use your map, or anything that would allow you to communicate with your map more effectively, using Explorer, we would like to hear it.
Thanks,
Mark
