[Talk-GB] mapping tunnels

[tim]

Navigating whilst driving through tunnels can be helped by reading the
cars computer, connecting to its OBD / ECU - you can get at least rpm
and speed, along with a whole load of other stuff - You can also tie
into the indicator lights (useful if there's a junction underground)


Its what the navtech vans use when they go underground (with a gyroscope)

On 9/28/07, Robert (Jamie) Munro <rjmunro at arjam.net> wrote:
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> Robert (Jamie) Munro wrote:
> > Thom Shannon wrote:
> >> actually ASN looks a bit smarter than that.
> >
> >> Here's another crazy idea. Use a video camera close to the road (I have
> >> a bullet cam that can be mounted on a car) then pattern match the images
> >> to track motion (like an optical mouse does) then combine that with a
> >> trace from a digital compass. Then by taking gps readings at either end
> >> of the tunnel you can calibrate those traces to counter cumulative
> >> error. You should then be able to get a really accurate trace.
> >
> > You might be better off using a ordinary forwards facing camera, and
> > match-mover software (like boujou) that the use in movie effects to work
> > out the camera movement and add virtual elements. There seems to be a
> > free match-mover (camera tracker) package at
> > http://digilab.uni-hannover.de/docs/manual.html
> > that's probably worth a try.
>
> Sorry, that should be
>
> http://www.digilab.uni-hannover.de/docs/manual.html
>
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