[OSM-talk] Mapping and surveying long road tunnels

Raphaël Jacquot sxpert at sxpert.org
Thu Mar 22 15:02:01 GMT 2007

Simon Hewison a écrit :
> 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.
> This is partly what those geospatialvision and the amazon mechanical turk 
> slaves do.
yes, but an IMU will give you points that you can insert into the GPX
file directly, which is much less work

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