Bushwalk Australia

How thorough is the 3D street navigation on google earth? The new google earth is promoting that its latest google earth contains navigation of streets in 3D. I wanna know how thorough this is, surely u couldnt navigate every street in the world in 3D. It would be good of you could though. Has anyone used this feature? What is it like? And how do you access it when using google earth?
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I would imagine this is done through a combination of various data sources:

GIS mapping information - roads, contours, etc. everything that google earth has at the moment.
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Google Street View

There is technology out there now that can analyse a series of photos of the same landscape and construct a 3D representation.
I imagine that the street view data probably has enough information to do this and that what they are talking about.

Instead of a flat projection of the street view information they'll actually render it in proper 3D.

So I imagine areas that arent covered with be pretty much just a 3D rendering based what GIS data is available.

http://sketchup.google.com/intl/en/yourworldin3d/

This probably helps too..... get everyone else to do it.