Woah, looks like #Klagenfurt has received a major 3D-data-update on Google Maps. Amazing details! Wonder how this is done...https://www.google.at/maps/@46.613052,14.2682105,124a,35y,46.92h,58.91t/data=!3m1!1e3 …
As someone who used to build LIDAR devices I'd say airborne LIDAR. For example, the RIEGL VQ-1560i (a device that that I helped build) could be used for applications like this. http://www.riegl.co.at/nc/products/airborne-scanning/produktdetail/product/scanner/55/ …
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I found this: “… that let us automatically create 3D cityscapes, complete with buildings, terrain and even landscaping, from 45-degree aerial imagery.” http://googleblog.blogspot.com/2012/06/never-ending-quest-for-perfect-map.html …
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Considering that Google Maps doesn't need a lot of accuracy and/or precision in their application I would say that's a much better fit than LIDAR. (To be honest I actually think that in the long run LIDAR will be replaced by Photogrammetry in almost all application domains.)
End of conversation
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