[OSM-talk] Mapping and surveying long road tunnels

Jon Burgess jburgess777 at googlemail.com
Thu Mar 22 22:37:50 GMT 2007

On Thu, 2007-03-22 at 16:02 +0100, Raphaël Jacquot wrote:
> 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

The cost of some IMUs is almost low enough for me to consider getting
one to experiment with, e.g.


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