Real Map Overlay (Texturing)

Hi,

my project (bachelor thesis) is using runtime-created height maps, which are in many cases based on real-world data and stored on a server. To make the maps really usable, I want to "paint" them with map-data provided by OpenStreetMaps, Google Maps or maybe even custom data which also would be stored on the server.
Now to the real question: Is there a simple way to texture the area (cut into 1025x1025 tiles) with map data? I know there are some tools which even download a whole terrain including height data, but I have no idea if they can be used at runtime because there are no test-versions.

Thanks in advance

 

alastair aitchison has some pretty interesting reads over at his site.
Some of his stuff is pretty impressive.

One small note - I think you'd want to make textures/tiles 1024x1024 to keep them divisible by 2.