In the last years, Google models not only are major cities, but also suburban and rural areas (google video)

I read that there are some tridimensional model building algorithm here.

How could such algoithm work? Stereovision? Multiple photos?

  • $\begingroup$ @ChristianClason Can you move it through StackExchange websites or should I? Thanks :) $\endgroup$ – Rowandish May 16 '16 at 15:00
  • $\begingroup$ Only moderators can do that; I flagged your question so they can take a look. $\endgroup$ – Christian Clason May 16 '16 at 15:53

They basically use 3D reconstruction based on ground and sometimes aerial footage of places, generally using stereo cameras. With this footage, they build a 3D point cloud based on the images to do the reconstruction (which is particularly trivial for a stereo setup).

I was told that if the reconstruction isn't good enough for more important/well known landmarks, they will have someone create a better 3D model in some CAD software. But I do think most of what they have, impressively, is done algorithmically based on 3D point clouds and potentially some other things I am unaware of (homographies maybe?).

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    $\begingroup$ My friend recently did a descriptively named PhD: "From images to point clouds: practical considerations for three-dimensional computer vision" Daniel Herrera Castro, dissertation (2015) Acta Univ Oul C 536. urn.fi/urn:isbn:9789526208534 $\endgroup$ – Olli Niemitalo May 16 '16 at 19:49

Not really a good answer, but I do know that Ben Appleton used to be in this part of Google, and his research interests include Embedded Voxel Colouring.

Note: I am not sure whether Google used this work in their Google Maps generation.

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    $\begingroup$ I think the Sydney office works on google maps so it may well be used. (Actually Ben got me an interview with google just as I was about to start my PhD.) $\endgroup$ – geometrikal May 17 '16 at 1:21
  • $\begingroup$ @geometrikal cool! I was in the same research group as Ben when he was doing his PhD at UQ. $\endgroup$ – Peter K. May 17 '16 at 1:55
  • $\begingroup$ Yes I had you as a lecturer I think? (Ross Marchant, you may remember me) $\endgroup$ – geometrikal May 17 '16 at 2:00
  • $\begingroup$ @geometrikal of course! I remember! Good to hear you're still kicking around. :-) $\endgroup$ – Peter K. May 17 '16 at 2:20

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