[Geowanking] Probe based mapping of road network
nelson at crynwr.com
Wed Nov 29 14:45:59 PST 2006
christopher.wilson at daimlerchrysler.com writes:
> We spent a couple of years looking at this and devised a k-means approach
> bundling data across the direction of travel to pull out the lanes. The
> data could then be grouped by lanes to derive centerlines. Stop signs and
> traffic lights were easy, we never got to yields or speed limits.
In principle, you can detect yields if you have enough data and enough
GPS receivers. If GPS-a and GPS-b are on the main and side road at
the same time, and GPS-b always yields to GPS-a, then you know you
have a yield situation. Oh, and if cars on the side road don't always
stop, it might be a yield.
Of course, it also might be a stoplight, which throws everything off. :-)
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