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.

Best luck in your project!

On Nov 5, 2012, at 2:39 PM, Vincent Habchi <vi...@macports.org> wrote:

> Hi Eve,
> 
>> Use overlays.  Look into ClassicMap: 
>> https://github.com/kishikawakatsumi/ClassicMap which is doing about the same 
>> thing using likely illegally obtained Google tiles.
> 
> I’ll have a look. It is actually displaying maps *over* a cartographic 
> background (and not some cartographic layer over the maps), isn’t it?
> 
> Cheers and thanks!
> Vincent


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