According to a Google Tech Talk recently given by George Wolberg a technology has been developed designed to take casual photographs and convert them quickly into texture-mapped 3D buildings. The technology, called PhotoSketch is intended to automate as much of the process as possible, while still requiring some human input. The key is that the methods do not require expensive cameras, laser finders, etc. It operates by extrapolating camera angle and position from the derived 3D of the building based on the photos. The key contributions of this work is that it merges the benefits of automatic feature extraction, multiview geometry, an intuitive sketching interface and also dynamic texture mapping to produce lightweight photorealistic 3D models of buildings.
The talk can be viewed at the link below and while it clocks in at slightly less than an hour (!) it is well worth watching since it presents general city modelling issues as they stand today, an overview of the system proposed and also results from experiments in large-scale urban scenes. Finally, the results are designed to integrate with Google SketchUp and are thus particularly suited to creating buildings for display in Google Earth.
http://video.google.com/videoplay?docid=-4452669873579375047
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