My car (Fiat Stilo) uses wheel rotation data to calculate turns & distance. It goes horribly wrong if you reverse round a corner while it's getting a GPS lock, but works well in tunnels. For what that's worth... Unfortunately there's no way to save tracks (I haven't tried opening the box!) & it does a 'lock to Navtech map' so it's no use for OSM & I drive with 2 sat-nav devices. Isn't that sad..
Mark tim wrote: > 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 <[EMAIL PROTECTED]> wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> 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 >> >> _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk-gb
