Eve,

> When you have alpha transparency you can either blend the aerial tiles into 
> the map view or blend the entire map view into the aerial tiles.  Either way, 
> I think, you can get something that looks good.  Semitransparent overlays 
> consisted of aerial tiles might actually work, and it is in the same 
> direction as my original recommendation.

Ok, I’ll definitely try.

> Best luck in your project!

Thanks. I’ll keep you posted if you want. Since this is basically an example 
for pedagogic purposes, I’ll publish anyhow the final code. So, if you’re 
interested… ;)

Have a great day/afternoon/evening/night, depending where you are on the planet
Vincent
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