Here some information obaut how the route for this year Tour de France where created.

The core information is published of the site www.letour.fr.
That is basically a long list of cities, villages and road crossings. there is also an information on which road they are on. (Well all in French but thats how i grew up)

Coordinates for this list of places are taken from a navigation programm, in this case Viamichelin.
This is the list you can find under the Waypoints folder in each stage.

The i use the driving directions from google earth to link the different places. So I do not even have to draw the track myself

Finally i analyse the resulting track at www.gpsvisualizer.com to find out the length of the track.

So basically I use different resources to combine the available information. Some being only available recently (driving directions from GE and GPSvisualizer).

To refine the work I upgraded to GE-Plus to be able to edit the resulting track within GE with more confort.
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Cheers, Christoph lucifer1.funpic.de