[OSM-talk] Mapping and surveying long road tunnels

Robert (Jamie) Munro rjmunro at arjam.net
Thu Mar 22 17:23:43 GMT 2007

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Simon Hewison wrote:
> Raphaël Jacquot wrote:
>> or, we could use IMUs and some kalmann filtering
> or video surveying. Marking key points on video frames from twin video 
> cameras (stereo vision) with the same focal length will get you a distance 
> of point on edge of tunnel from point of view. Couple with a distance 
> measurement from wheel counter and you have a quite clever system.

That is a really good suggestion. In fact, you don't need stereo vision
or wheel counters or anything, just a software packages called boujou.
This automatically tracks points in the scene, calibrates everything,
and tracks them through 3d space. All you need to do is scale the output
based on

> This is partly what those geospatialvision and the amazon mechanical turk 
> slaves do.

Geospatial vision is owned by the same people as 2d3, who make boujou. :-)

The only problem is that boujou is way too expensive for us.

Robert (Jamie) Munro
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