Hi Remi,
Nice chatting with you at the WebGL meetup.
As we discussed, it would be great to collaborate on creating a working example of your 3D REST spec using Earth height maps by NASA.
This is the main resource I'm using:
My aim is to release all the raw assets as open source at:
And a full web service, free to use for educational purposes at:
Hopefully we can make it the definitive solution to download terrains.
Cheers