1dayfit wrote:How brilliant would that be. must be easily possible with google earth etc.
Easy? Calculate 3D objects from millions of 2D pictures with a lot of moving parts.
Sorry, I did over ten years photogrammetrie in industrial projects nearly every day so I knew the requirements well.
For a fly-through by air plane it can work, because you don't see the most faults because it will covert by a speed over 100 km per hour, but by cycling you would get headache by looking all the idiosyncrasy's very fast.
In area with no moving part and all simply objects at least 10-20 meters and complicated like trees about 50m from your bicycle, it can look good.
Oh yes, I would like to drive virtual many routes but easy to realize is it sure not.

Additional: Running on a fixed route and angle of view like in Wii Fit jogging is far easier to realize.